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شائع علم المثلثات >

(sec(330))/(cot(210))

الحلّ

\frac{sec ( 33 0 ^{\circ} )}{cot ( 21 0 ^{\circ} )}

الحلّ

\frac{2}{3}

عشري

0.66666 \dots

خطوات الحلّ

\frac{sec ( 33 0 ^{\circ} )}{cot ( 21 0 ^{\circ} )}

Rewrite using trig identities:

sec (33 0^{\circ}) = \frac{2 3}{3}

sec (33 0^{\circ})

Rewrite using trig identities:

\frac{1}{cos ( 33 0 ^{\circ} )}

sec (33 0^{\circ})

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

:Use the basic trigonometric identity

= \frac{1}{cos ( 33 0 ^{\circ} )}

= \frac{1}{cos ( 33 0 ^{\circ} )}

Rewrite using trig identities:

cos (33 0^{\circ}) = \frac{3}{2}

cos (33 0^{\circ})

Rewrite using trig identities:

cos (18 0^{\circ}) cos (15 0^{\circ}) - sin (18 0^{\circ}) sin (15 0^{\circ})

cos (33 0^{\circ})

cos (18 0^{\circ} + 15 0^{\circ})

كـ

cos (33 0^{\circ})

أكتب

= cos (18 0^{\circ} + 15 0^{\circ})

cos (s + t) = cos (s) cos (t) - sin (s) sin (t)

:فعّل متطابقة الجمع لزوايا

= cos (18 0^{\circ}) cos (15 0^{\circ}) - sin (18 0^{\circ}) sin (15 0^{\circ})

= cos (18 0^{\circ}) cos (15 0^{\circ}) - sin (18 0^{\circ}) sin (15 0^{\circ})

استخدم المتطابقة الأساسيّة التالية:

cos (18 0^{\circ}) = (- 1)

cos (18 0^{\circ})

cos (x)

periodicity table with

36 0^{\circ} n

cycle:

x 0 3 0^{\circ} 4 5^{\circ} 6 0^{\circ} 9 0^{\circ} 12 0^{\circ} 13 5^{\circ} 15 0^{\circ} cos (x) 1 \frac{3}{2} \frac{2}{2} \frac{1}{2} 0 - \frac{1}{2} - \frac{2}{2} - \frac{3}{2} x 18 0^{\circ} 21 0^{\circ} 22 5^{\circ} 24 0^{\circ} 27 0^{\circ} 30 0^{\circ} 31 5^{\circ} 33 0^{\circ} cos (x) - 1 - \frac{3}{2} - \frac{2}{2} - \frac{1}{2} 0 \frac{1}{2} \frac{2}{2} \frac{3}{2}

= (- 1)

استخدم المتطابقة الأساسيّة التالية:

cos (15 0^{\circ}) = - \frac{3}{2}

cos (15 0^{\circ})

cos (x)

periodicity table with

36 0^{\circ} n

cycle:

x 0 3 0^{\circ} 4 5^{\circ} 6 0^{\circ} 9 0^{\circ} 12 0^{\circ} 13 5^{\circ} 15 0^{\circ} cos (x) 1 \frac{3}{2} \frac{2}{2} \frac{1}{2} 0 - \frac{1}{2} - \frac{2}{2} - \frac{3}{2} x 18 0^{\circ} 21 0^{\circ} 22 5^{\circ} 24 0^{\circ} 27 0^{\circ} 30 0^{\circ} 31 5^{\circ} 33 0^{\circ} cos (x) - 1 - \frac{3}{2} - \frac{2}{2} - \frac{1}{2} 0 \frac{1}{2} \frac{2}{2} \frac{3}{2}

= - \frac{3}{2}

استخدم المتطابقة الأساسيّة التالية:

sin (18 0^{\circ}) = 0

sin (18 0^{\circ})

sin (x)

periodicity table with

36 0^{\circ} n

cycle:

x 0 3 0^{\circ} 4 5^{\circ} 6 0^{\circ} 9 0^{\circ} 12 0^{\circ} 13 5^{\circ} 15 0^{\circ} sin (x) 0 \frac{1}{2} \frac{2}{2} \frac{3}{2} 1 \frac{3}{2} \frac{2}{2} \frac{1}{2} x 18 0^{\circ} 21 0^{\circ} 22 5^{\circ} 24 0^{\circ} 27 0^{\circ} 30 0^{\circ} 31 5^{\circ} 33 0^{\circ} sin (x) 0 - \frac{1}{2} - \frac{2}{2} - \frac{3}{2} - 1 - \frac{3}{2} - \frac{2}{2} - \frac{1}{2}

= 0

استخدم المتطابقة الأساسيّة التالية:

sin (15 0^{\circ}) = \frac{1}{2}

sin (15 0^{\circ})

sin (x)

periodicity table with

36 0^{\circ} n

cycle:

x 0 3 0^{\circ} 4 5^{\circ} 6 0^{\circ} 9 0^{\circ} 12 0^{\circ} 13 5^{\circ} 15 0^{\circ} sin (x) 0 \frac{1}{2} \frac{2}{2} \frac{3}{2} 1 \frac{3}{2} \frac{2}{2} \frac{1}{2} x 18 0^{\circ} 21 0^{\circ} 22 5^{\circ} 24 0^{\circ} 27 0^{\circ} 30 0^{\circ} 31 5^{\circ} 33 0^{\circ} sin (x) 0 - \frac{1}{2} - \frac{2}{2} - \frac{3}{2} - 1 - \frac{3}{2} - \frac{2}{2} - \frac{1}{2}

= \frac{1}{2}

= (- 1) (- \frac{3}{2}) - 0 \cdot \frac{1}{2}

بسّط

= \frac{3}{2}

= \frac{1}{\frac{3}{2}}

\frac{1}{\frac{3}{2}}

بسّط:

\frac{2 3}{3}

\frac{1}{\frac{3}{2}}

\frac{1}{\frac{b}{c}} = \frac{c}{b}

: استخدم ميزات الكسور التالية

= \frac{2}{3}

\frac{2}{3}

حوّل لصيغة عدد كسريّ:

\frac{2 3}{3}

\frac{2}{3}

\frac{3}{3}

اضرب بالمرافق

= \frac{2 3}{3 3}

33 = 3

33

a a = a

:فعْل قانون الجذور

33 = 3

= 3

= \frac{2 3}{3}

= \frac{2 3}{3}

= \frac{2 3}{3}

Rewrite using trig identities:

cot (21 0^{\circ}) = 3

cot (21 0^{\circ})

cot (21 0^{\circ}) = cot (3 0^{\circ})

cot (21 0^{\circ})

18 0^{\circ} + 3 0^{\circ}

كـ

21 0^{\circ}

اكتب مجددًا

= cot (18 0^{\circ} + 3 0^{\circ})

cot (x + 18 0^{\circ}) = cot (x)

cot :

استخدم دوريّة الـ

cot (18 0^{\circ} + 3 0^{\circ}) = cot (3 0^{\circ})

= cot (3 0^{\circ})

= cot (3 0^{\circ})

استخدم المتطابقة الأساسيّة التالية:

cot (3 0^{\circ}) = 3

cot (3 0^{\circ})

cot (x)

periodicity table with

18 0^{\circ} n

cycle:

x 0 3 0^{\circ} 4 5^{\circ} 6 0^{\circ} 9 0^{\circ} 12 0^{\circ} 13 5^{\circ} 15 0^{\circ} cot (x) \mp \infty 31 \frac{3}{3} 0 - \frac{3}{3} - 1 - 3

= 3

= 3

= \frac{\frac{2 3}{3}}{3}

\frac{\frac{2 3}{3}}{3}

بسّط:

\frac{2}{3}

\frac{\frac{2 3}{3}}{3}

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

: استخدم ميزات الكسور التالية

= \frac{2 3}{3 3}

\frac{2 3}{3 3}

حوّل لصيغة عدد كسريّ:

\frac{2}{3}

\frac{2 3}{3 3}

\frac{3}{3}

اضرب بالمرافق

= \frac{2 3 3}{3 3 3}

233 = 6

233

a a = a

:فعْل قانون الجذور

33 = 3

= 2 \cdot 3

2 \cdot 3 = 6 :

اضرب الأعداد

= 6

333 = 9

333

a^{b} \cdot a^{c} = a^{b + c}

:فعّل قانون القوى

333 = 3 \cdot 3^{\frac{1}{2}} \cdot 3^{\frac{1}{2}} = 3^{1 + \frac{1}{2} + \frac{1}{2}}

= 3^{1 + \frac{1}{2} + \frac{1}{2}}

\frac{1}{2} + \frac{1}{2} = 2 \cdot \frac{1}{2} :

اجمع العناصر المتشابهة

= 3^{1 + 2 \cdot \frac{1}{2}}

2 \cdot \frac{1}{2} = 1

2 \cdot \frac{1}{2}

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

:اضرب كسور

= \frac{1 \cdot 2}{2}

2 :

إلغ العوامل المشتركة

= 1

= 3^{1 + 1}

1 + 1 = 2 :

اجمع الأعداد

= 3^{2}

3^{2} = 9

= 9

= \frac{6}{9}

3 :

إلغ العوامل المشتركة

= \frac{2}{3}

= \frac{2}{3}

= \frac{2}{3}

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