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شائع علم المثلثات >

(cot(θ)+csc(θ))/(sec(θ)+1)=sin(θ)

الحلّ

\frac{cot ( θ ) + csc ( θ )}{sec ( θ ) + 1} = sin (θ)

الحلّ

θ = 0.90455 \dots + 2 πn, θ = 2 π - 0.90455 \dots + 2 πn

درجات

θ = 51.82729 \dots^{\circ} + 36 0^{\circ} n, θ = 308.17270 \dots^{\circ} + 36 0^{\circ} n

خطوات الحلّ

\frac{cot ( θ ) + csc ( θ )}{sec ( θ ) + 1} = sin (θ)

من الطرفين

sin (θ)

اطرح

\frac{cot ( θ ) + csc ( θ )}{sec ( θ ) + 1} - sin (θ) = 0

\frac{cot ( θ ) + csc ( θ )}{sec ( θ ) + 1} - sin (θ)

بسّط:

\frac{cot ( θ ) + csc ( θ ) - sin ( θ ) ( sec ( θ ) + 1 )}{sec ( θ ) + 1}

\frac{cot ( θ ) + csc ( θ )}{sec ( θ ) + 1} - sin (θ)

sin (θ) = \frac{sin ( θ ) ( sec ( θ ) + 1 )}{sec ( θ ) + 1}

:حوّل الأعداد لكسور

= \frac{cot ( θ ) + csc ( θ )}{sec ( θ ) + 1} - \frac{sin ( θ ) ( sec ( θ ) + 1 )}{sec ( θ ) + 1}

\frac{a}{c} \pm \frac{b}{c} = \frac{a \pm b}{c}

:بما أنّ المقامات متساوية، اجمع البسوط

= \frac{cot ( θ ) + csc ( θ ) - sin ( θ ) ( sec ( θ ) + 1 )}{sec ( θ ) + 1}

\frac{cot ( θ ) + csc ( θ ) - sin ( θ ) ( sec ( θ ) + 1 )}{sec ( θ ) + 1} = 0

\frac{f ( x )}{g ( x )} = 0 \Rightarrow f (x) = 0

cot (θ) + csc (θ) - sin (θ) (sec (θ) + 1) = 0

sin, cos :

عبّر بواسطة

cot (θ) + csc (θ) - (1 + sec (θ)) sin (θ)

cot (x) = \frac{cos ( x )}{sin ( x )}

:Use the basic trigonometric identity

= \frac{cos ( θ )}{sin ( θ )} + csc (θ) - (1 + sec (θ)) sin (θ)

csc (x) = \frac{1}{sin ( x )}

:Use the basic trigonometric identity

= \frac{cos ( θ )}{sin ( θ )} + \frac{1}{sin ( θ )} - (1 + sec (θ)) sin (θ)

sec (x) = \frac{1}{cos ( x )}

:Use the basic trigonometric identity

= \frac{cos ( θ )}{sin ( θ )} + \frac{1}{sin ( θ )} - (1 + \frac{1}{cos ( θ )}) sin (θ)

\frac{cos ( θ )}{sin ( θ )} + \frac{1}{sin ( θ )} - (1 + \frac{1}{cos ( θ )}) sin (θ)

بسّط:

\frac{cos ( θ ) ( cos ( θ ) + 1 ) - sin ^{2} ( θ ) ( cos ( θ ) + 1 )}{sin ( θ ) cos ( θ )}

\frac{cos ( θ )}{sin ( θ )} + \frac{1}{sin ( θ )} - (1 + \frac{1}{cos ( θ )}) sin (θ)

\frac{cos ( θ )}{sin ( θ )} + \frac{1}{sin ( θ )}

وحّد الكسور:

\frac{cos ( θ ) + 1}{sin ( θ )}

\frac{a}{c} \pm \frac{b}{c} = \frac{a \pm b}{c}

فعّل القانون

= \frac{cos ( θ ) + 1}{sin ( θ )}

= \frac{cos ( θ ) + 1}{sin ( θ )} - sin (θ) (\frac{1}{cos ( θ )} + 1)

1 + \frac{1}{cos ( θ )}

وحّد:

\frac{cos ( θ ) + 1}{cos ( θ )}

1 + \frac{1}{cos ( θ )}

1 = \frac{1 cos ( θ )}{cos ( θ )}

:حوّل الأعداد لكسور

= \frac{1 \cdot cos ( θ )}{cos ( θ )} + \frac{1}{cos ( θ )}

\frac{a}{c} \pm \frac{b}{c} = \frac{a \pm b}{c}

:بما أنّ المقامات متساوية، اجمع البسوط

= \frac{1 \cdot cos ( θ ) + 1}{cos ( θ )}

1 \cdot cos (θ) = cos (θ) :

اضرب

= \frac{cos ( θ ) + 1}{cos ( θ )}

= \frac{cos ( θ ) + 1}{sin ( θ )} - \frac{cos ( θ ) + 1}{cos ( θ )} sin (θ)

\frac{cos ( θ ) + 1}{cos ( θ )} sin (θ)

اضرب بـ:

\frac{sin ( θ ) ( cos ( θ ) + 1 )}{cos ( θ )}

\frac{cos ( θ ) + 1}{cos ( θ )} sin (θ)

a \cdot \frac{b}{c} = \frac{a \cdot b}{c}

:اضرب كسور

= \frac{( cos ( θ ) + 1 ) sin ( θ )}{cos ( θ )}

= \frac{cos ( θ ) + 1}{sin ( θ )} - \frac{( cos ( θ ) + 1 ) sin ( θ )}{cos ( θ )}

sin (θ), cos (θ)

المضاعف المشترك الأصغر لـ:

sin (θ) cos (θ)

sin (θ), cos (θ)

Lowest Common Multiplier (LCM)

Compute an expression comprised of factors that appear either in

sin (θ)

cos (θ)

= sin (θ) cos (θ)

اكتب مجددًا الكسور بحيث يكون المقام مشترك

sin (θ) cos (θ)

اضرب كل بسط ومقام بتعبير الذي يؤدّي إلى مقام مشترك

For

\frac{cos ( θ ) + 1}{sin ( θ )} :

multiply the denominator and numerator by

cos (θ)

\frac{cos ( θ ) + 1}{sin ( θ )} = \frac{( cos ( θ ) + 1 ) cos ( θ )}{sin ( θ ) cos ( θ )}

For

\frac{( cos ( θ ) + 1 ) sin ( θ )}{cos ( θ )} :

multiply the denominator and numerator by

sin (θ)

\frac{( cos ( θ ) + 1 ) sin ( θ )}{cos ( θ )} = \frac{( cos ( θ ) + 1 ) sin ( θ ) sin ( θ )}{cos ( θ ) sin ( θ )} = \frac{sin ^{2} ( θ ) ( cos ( θ ) + 1 )}{sin ( θ ) cos ( θ )}

= \frac{( cos ( θ ) + 1 ) cos ( θ )}{sin ( θ ) cos ( θ )} - \frac{sin ^{2} ( θ ) ( cos ( θ ) + 1 )}{sin ( θ ) cos ( θ )}

\frac{a}{c} \pm \frac{b}{c} = \frac{a \pm b}{c}

:بما أنّ المقامات متساوية، اجمع البسوط

= \frac{( cos ( θ ) + 1 ) cos ( θ ) - sin ^{2} ( θ ) ( cos ( θ ) + 1 )}{sin ( θ ) cos ( θ )}

= \frac{cos ( θ ) ( cos ( θ ) + 1 ) - sin ^{2} ( θ ) ( cos ( θ ) + 1 )}{sin ( θ ) cos ( θ )}

\frac{( 1 + cos ( θ ) ) cos ( θ ) - ( 1 + cos ( θ ) ) sin ^{2} ( θ )}{cos ( θ ) sin ( θ )} = 0

\frac{f ( x )}{g ( x )} = 0 \Rightarrow f (x) = 0

(1 + cos (θ)) cos (θ) - (1 + cos (θ)) sin^{2} (θ) = 0

(1 + cos (θ)) cos (θ) - (1 + cos (θ)) sin^{2} (θ)

حلل إلى عوامل:

(1 + cos (θ)) (cos (θ) - sin^{2} (θ))

(1 + cos (θ)) cos (θ) - (1 + cos (θ)) sin^{2} (θ)

(1 + cos (θ))

قم باخراج العامل المشترك

= (1 + cos (θ)) (cos (θ) - sin^{2} (θ))

(1 + cos (θ)) (cos (θ) - sin^{2} (θ)) = 0

حلّ كل جزء على حدة

1 + cos (θ) = 0 or cos (θ) - sin^{2} (θ) = 0

1 + cos (θ) = 0 : θ = π + 2 πn

1 + cos (θ) = 0

انقل

1

إلى الجانب الأيمن

1 + cos (θ) = 0

من الطرفين

1

اطرح

1 + cos (θ) - 1 = 0 - 1

بسّط

cos (θ) = - 1

cos (θ) = - 1

cos (θ) = - 1 :

حلول عامّة لـ

cos (x)

periodicity table with

2 πn

cycle:

x 0 \frac{π}{6} \frac{π}{4} \frac{π}{3} \frac{π}{2} \frac{2 π}{3} \frac{3 π}{4} \frac{5 π}{6} cos (x) 1 \frac{3}{2} \frac{2}{2} \frac{1}{2} 0 - \frac{1}{2} - \frac{2}{2} - \frac{3}{2} x π \frac{7 π}{6} \frac{5 π}{4} \frac{4 π}{3} \frac{3 π}{2} \frac{5 π}{3} \frac{7 π}{4} \frac{11 π}{6} cos (x) - 1 - \frac{3}{2} - \frac{2}{2} - \frac{1}{2} 0 \frac{1}{2} \frac{2}{2} \frac{3}{2}

θ = π + 2 πn

θ = π + 2 πn

cos (θ) - sin^{2} (θ) = 0 : θ = arccos (\frac{- 1 + 5}{2}) + 2 πn, θ = 2 π - arccos (\frac{- 1 + 5}{2}) + 2 πn

cos (θ) - sin^{2} (θ) = 0

Rewrite using trig identities

cos (θ) - sin^{2} (θ)

cos^{2} (x) + sin^{2} (x) = 1

:فعّل نطريّة فيتاغوروس

sin^{2} (x) = 1 - cos^{2} (x)

= cos (θ) - (1 - cos^{2} (θ))

- (1 - cos^{2} (θ)) : - 1 + cos^{2} (θ)

- (1 - cos^{2} (θ))

افتح أقواس

= - (1) - (- cos^{2} (θ))

فعّل قوانين سالب-موجب

- (- a) = a, - (a) = - a

= - 1 + cos^{2} (θ)

= cos (θ) - 1 + cos^{2} (θ)

- 1 + cos (θ) + cos^{2} (θ) = 0

بالاستعانة بطريقة التعويض

- 1 + cos (θ) + cos^{2} (θ) = 0

cos (θ) = u :

على افتراض أنّ

- 1 + u + u^{2} = 0

- 1 + u + u^{2} = 0 : u = \frac{- 1 + 5}{2}, u = \frac{- 1 - 5}{2}

- 1 + u + u^{2} = 0

a x^{2} + b x + c = 0

اكتب بالصورة الاعتياديّة

u^{2} + u - 1 = 0

حلّ بالاستعانة بالصيغة التربيعيّة

u^{2} + u - 1 = 0

الصيغة لحلّ المعادلة التربيعيّة

a = 1, b = 1, c = - 1

لـ

u_{1, 2} = \frac{- 1 \pm 1 ^{2} - 4 \cdot 1 \cdot ( - 1 )}{2 \cdot 1}

u_{1, 2} = \frac{- 1 \pm 1 ^{2} - 4 \cdot 1 \cdot ( - 1 )}{2 \cdot 1}

1^{2} - 4 \cdot 1 \cdot (- 1) = 5

1^{2} - 4 \cdot 1 \cdot (- 1)

1^{a} = 1

فعّل القانون

1^{2} = 1

= 1 - 4 \cdot 1 \cdot (- 1)

- (- a) = a

فعّل القانون

= 1 + 4 \cdot 1 \cdot 1

4 \cdot 1 \cdot 1 = 4 :

اضرب الأعداد

= 1 + 4

1 + 4 = 5 :

اجمع الأعداد

= 5

u_{1, 2} = \frac{- 1 \pm 5}{2 \cdot 1}

Separate the solutions

u_{1} = \frac{- 1 + 5}{2 \cdot 1}, u_{2} = \frac{- 1 - 5}{2 \cdot 1}

u = \frac{- 1 + 5}{2 \cdot 1} : \frac{- 1 + 5}{2}

\frac{- 1 + 5}{2 \cdot 1}

2 \cdot 1 = 2 :

اضرب الأعداد

= \frac{- 1 + 5}{2}

u = \frac{- 1 - 5}{2 \cdot 1} : \frac{- 1 - 5}{2}

\frac{- 1 - 5}{2 \cdot 1}

2 \cdot 1 = 2 :

اضرب الأعداد

= \frac{- 1 - 5}{2}

حلول المعادلة التربيعيّة هي

u = \frac{- 1 + 5}{2}, u = \frac{- 1 - 5}{2}

u = cos (θ)

استبدل مجددًا

cos (θ) = \frac{- 1 + 5}{2}, cos (θ) = \frac{- 1 - 5}{2}

cos (θ) = \frac{- 1 + 5}{2}, cos (θ) = \frac{- 1 - 5}{2}

cos (θ) = \frac{- 1 + 5}{2} : θ = arccos (\frac{- 1 + 5}{2}) + 2 πn, θ = 2 π - arccos (\frac{- 1 + 5}{2}) + 2 πn

cos (θ) = \frac{- 1 + 5}{2}

Apply trig inverse properties

cos (θ) = \frac{- 1 + 5}{2}

cos (θ) = \frac{- 1 + 5}{2} :

حلول عامّة لـ

cos (x) = a \Rightarrow x = arccos (a) + 2 πn, x = 2 π - arccos (a) + 2 πn

θ = arccos (\frac{- 1 + 5}{2}) + 2 πn, θ = 2 π - arccos (\frac{- 1 + 5}{2}) + 2 πn

θ = arccos (\frac{- 1 + 5}{2}) + 2 πn, θ = 2 π - arccos (\frac{- 1 + 5}{2}) + 2 πn

cos (θ) = \frac{- 1 - 5}{2} :

لا يوجد حلّ

cos (θ) = \frac{- 1 - 5}{2}

- 1 \leq cos (x) \leq 1

لا يوجد حلّ

وحّد الحلول

θ = arccos (\frac{- 1 + 5}{2}) + 2 πn, θ = 2 π - arccos (\frac{- 1 + 5}{2}) + 2 πn

وحّد الحلول

θ = π + 2 πn, θ = arccos (\frac{- 1 + 5}{2}) + 2 πn, θ = 2 π - arccos (\frac{- 1 + 5}{2}) + 2 πn

π + 2 πn :

بما أنّ المعادلة غير معرّفة لـ

θ = arccos (\frac{- 1 + 5}{2}) + 2 πn, θ = 2 π - arccos (\frac{- 1 + 5}{2}) + 2 πn

أظهر الحلّ بالتمثيل العشريّ

θ = 0.90455 \dots + 2 πn, θ = 2 π - 0.90455 \dots + 2 πn

رسم

أمثلة شائعة

1/(cos(2x))+tan(2x)=3cos(2x),0<x<90

\frac{1}{cos ( 2 x )} + tan (2 x) = 3 cos (2 x), 0^{\circ} < x < 9 0^{\circ}

sin(x)= 4/5 ,0<= x<2pi

sin (x) = \frac{4}{5}, 0 \leq x < 2 π

7sin^2(θ)-5sin(θ)=2

7 sin^{2} (θ) - 5 sin (θ) = 2

sec(2x)=-(2/(sqrt(3)))

sec (2 x) = - (\frac{2}{3})

(e^{-ln(-(sin(θ))/(cos(θ)))})/2*sin(θ)=0

\frac{e ^{- l n (- \frac{s i n ( θ )}{c o s ( θ )})}}{2} \cdot sin (θ) = 0