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Popular Trigonometría >

(sec(x)+tan(x))/(cot(x)+cos(x))=sec^2(x)

Solución

\frac{sec ( x ) + tan ( x )}{cot ( x ) + cos ( x )} = sec^{2} (x)

Solución

Sin soluci \overset{o}{ˊ} n para x \in R

Pasos de solución

\frac{sec ( x ) + tan ( x )}{cot ( x ) + cos ( x )} = sec^{2} (x)

Restar

sec^{2} (x)

de ambos lados

\frac{sec ( x ) + tan ( x )}{cot ( x ) + cos ( x )} - sec^{2} (x) = 0

Simplificar

\frac{sec ( x ) + tan ( x )}{cot ( x ) + cos ( x )} - sec^{2} (x) : \frac{sec ( x ) + tan ( x ) - sec ^{2} ( x ) ( cot ( x ) + cos ( x ) )}{cot ( x ) + cos ( x )}

\frac{sec ( x ) + tan ( x )}{cot ( x ) + cos ( x )} - sec^{2} (x)

Convertir a fracción:

sec^{2} (x) = \frac{sec ^{2} ( x ) ( cot ( x ) + cos ( x ) )}{cot ( x ) + cos ( x )}

= \frac{sec ( x ) + tan ( x )}{cot ( x ) + cos ( x )} - \frac{sec ^{2} ( x ) ( cot ( x ) + cos ( x ) )}{cot ( x ) + cos ( x )}

Ya que los denominadores son iguales, combinar las fracciones:

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

= \frac{sec ( x ) + tan ( x ) - sec ^{2} ( x ) ( cot ( x ) + cos ( x ) )}{cot ( x ) + cos ( x )}

\frac{sec ( x ) + tan ( x ) - sec ^{2} ( x ) ( cot ( x ) + cos ( x ) )}{cot ( x ) + cos ( x )} = 0

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

sec (x) + tan (x) - sec^{2} (x) (cot (x) + cos (x)) = 0

Expresar con seno, coseno

sec (x) + tan (x) - (cos (x) + cot (x)) sec^{2} (x)

Utilizar la identidad trigonométrica básica:

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

= \frac{1}{cos ( x )} + tan (x) - (cos (x) + cot (x)) (\frac{1}{cos ( x )})^{2}

Utilizar la identidad trigonométrica básica:

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

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

Utilizar la identidad trigonométrica básica:

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

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

Simplificar

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

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

Combinar las fracciones usando el mínimo común denominador:

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

Aplicar la regla

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

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

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

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

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

Simplificar

cos (x) + \frac{cos ( x )}{sin ( x )}

en una fracción:

\frac{cos ( x ) sin ( x ) + cos ( x )}{sin ( x )}

cos (x) + \frac{cos ( x )}{sin ( x )}

Convertir a fracción:

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

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

Ya que los denominadores son iguales, combinar las fracciones:

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

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

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

(\frac{1}{cos ( x )})^{2} = \frac{1}{cos ^{2} ( x )}

(\frac{1}{cos ( x )})^{2}

Aplicar las leyes de los exponentes:

(\frac{a}{b})^{c} = \frac{a ^{c}}{b ^{c}}

= \frac{1 ^{2}}{cos ^{2} ( x )}

Aplicar la regla

1^{a} = 1

1^{2} = 1

= \frac{1}{cos ^{2} ( x )}

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

Multiplicar fracciones:

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

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

(cos (x) sin (x) + cos (x)) \cdot 1 = cos (x) sin (x) + cos (x)

(cos (x) sin (x) + cos (x)) \cdot 1

Multiplicar:

(cos (x) sin (x) + cos (x)) \cdot 1 = (cos (x) sin (x) + cos (x))

= (cos (x) sin (x) + cos (x))

Quitar los parentesis:

(a) = a

= cos (x) sin (x) + cos (x)

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

Factorizar el termino común

cos (x)

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

Eliminar los terminos comunes:

cos (x)

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

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

Mínimo común múltiplo de

cos (x), sin (x) cos (x) : cos (x) sin (x)

cos (x), sin (x) cos (x)

Mínimo común múltiplo (MCM)

Calcular una expresión que este compuesta de factores que aparezcan tanto en

cos (x)

sin (x) cos (x)

= cos (x) sin (x)

Reescribir las fracciones basandose en el mínimo común denominador

Multiplicar cada numerador por la misma cantidad necesaria para multiplicar el denominador correspondiente y convertirlo en el mínimo común denominador

Para

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

multiplicar el denominador y el numerador por

sin (x)

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

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

Ya que los denominadores son iguales, combinar las fracciones:

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

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

Expandir

(1 + sin (x)) sin (x) - (sin (x) + 1) : sin^{2} (x) - 1

(1 + sin (x)) sin (x) - (sin (x) + 1)

= sin (x) (1 + sin (x)) - (sin (x) + 1)

Expandir

sin (x) (1 + sin (x)) : sin (x) + sin^{2} (x)

sin (x) (1 + sin (x))

Poner los parentesis utilizando:

a (b + c) = ab + a c

a = sin (x), b = 1, c = sin (x)

= sin (x) \cdot 1 + sin (x) sin (x)

= 1 \cdot sin (x) + sin (x) sin (x)

Simplificar

1 \cdot sin (x) + sin (x) sin (x) : sin (x) + sin^{2} (x)

1 \cdot sin (x) + sin (x) sin (x)

1 \cdot sin (x) = sin (x)

1 \cdot sin (x)

Multiplicar:

1 \cdot sin (x) = sin (x)

= sin (x)

sin (x) sin (x) = sin^{2} (x)

sin (x) sin (x)

Aplicar las leyes de los exponentes:

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

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

= sin^{1 + 1} (x)

Sumar:

1 + 1 = 2

= sin^{2} (x)

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

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

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

- (sin (x) + 1) : - sin (x) - 1

- (sin (x) + 1)

Poner los parentesis

= - (sin (x)) - (1)

Aplicar las reglas de los signos

+ (- a) = - a

= - sin (x) - 1

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

Sumar elementos similares:

sin (x) - sin (x) = 0

= sin^{2} (x) - 1

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

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

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

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

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

Usando el método de sustitución

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

Sea:

sin (x) = u

- 1 + u^{2} = 0

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

- 1 + u^{2} = 0

Desplace

1

a la derecha

- 1 + u^{2} = 0

Sumar

1

a ambos lados

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

Simplificar

u^{2} = 1

u^{2} = 1

Para

x^{2} = f (a)

las soluciones son

x = f (a), - f (a)

u = 1, u = - 1

1 = 1

1

Aplicar la regla

1 = 1

= 1

- 1 = - 1

- 1

Aplicar la regla

1 = 1

= - 1

u = 1, u = - 1

Sustituir en la ecuación

u = sin (x)

sin (x) = 1, sin (x) = - 1

sin (x) = 1, sin (x) = - 1

sin (x) = 1 : x = \frac{π}{2} + 2 πn

sin (x) = 1

Soluciones generales para

sin (x) = 1

tabla de valores periódicos con

2 πn

intervalos:

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} sin (x) 0 \frac{1}{2} \frac{2}{2} \frac{3}{2} 1 \frac{3}{2} \frac{2}{2} \frac{1}{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} sin (x) 0 - \frac{1}{2} - \frac{2}{2} - \frac{3}{2} - 1 - \frac{3}{2} - \frac{2}{2} - \frac{1}{2}

x = \frac{π}{2} + 2 πn

x = \frac{π}{2} + 2 πn

sin (x) = - 1 : x = \frac{3 π}{2} + 2 πn

sin (x) = - 1

Soluciones generales para

sin (x) = - 1

tabla de valores periódicos con

2 πn

intervalos:

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} sin (x) 0 \frac{1}{2} \frac{2}{2} \frac{3}{2} 1 \frac{3}{2} \frac{2}{2} \frac{1}{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} sin (x) 0 - \frac{1}{2} - \frac{2}{2} - \frac{3}{2} - 1 - \frac{3}{2} - \frac{2}{2} - \frac{1}{2}

x = \frac{3 π}{2} + 2 πn

x = \frac{3 π}{2} + 2 πn

Combinar toda las soluciones

x = \frac{π}{2} + 2 πn, x = \frac{3 π}{2} + 2 πn

Siendo que la ecuación esta indefinida para:

\frac{π}{2} + 2 πn, \frac{3 π}{2} + 2 πn

Sin soluci \overset{o}{ˊ} n para x \in R

Gráfica

Ejemplos populares

2cos^2(θ)-2sin^2(θ)=sqrt(2)