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Popular Trigonometría >

tan^2(x)-sin(x)=tan^2(x)sin^2(x)

Solución

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

Solución

x = 2 πn, x = π + 2 πn

Grados

x = 0^{\circ} + 36 0^{\circ} n, x = 18 0^{\circ} + 36 0^{\circ} n

Pasos de solución

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

Restar

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

de ambos lados

tan^{2} (x) - sin (x) - tan^{2} (x) sin^{2} (x) = 0

Expresar con seno, coseno

- sin (x) + tan^{2} (x) - sin^{2} (x) tan^{2} (x)

Utilizar la identidad trigonométrica básica:

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

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

Simplificar

- sin (x) + (\frac{sin ( x )}{cos ( x )})^{2} - sin^{2} (x) (\frac{sin ( x )}{cos ( x )})^{2} : \frac{- cos ^{2} ( x ) sin ( x ) + sin ^{2} ( x ) - sin ^{4} ( x )}{cos ^{2} ( x )}

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

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

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

Aplicar las leyes de los exponentes:

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

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

sin^{2} (x) (\frac{sin ( x )}{cos ( x )})^{2} = \frac{sin ^{4} ( x )}{cos ^{2} ( x )}

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

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

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

Aplicar las leyes de los exponentes:

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

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

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

Multiplicar fracciones:

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

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

sin^{2} (x) sin^{2} (x) = sin^{4} (x)

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

Aplicar las leyes de los exponentes:

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

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

= sin^{2 + 2} (x)

Sumar:

2 + 2 = 4

= sin^{4} (x)

= \frac{sin ^{4} ( x )}{cos ^{2} ( x )}

= - sin (x) + \frac{sin ^{2} ( x )}{cos ^{2} ( x )} - \frac{sin ^{4} ( x )}{cos ^{2} ( x )}

Combinar las fracciones usando el mínimo común denominador:

\frac{sin ^{2} ( x ) - sin ^{4} ( x )}{cos ^{2} ( x )}

Aplicar la regla

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

= \frac{sin ^{2} ( x ) - sin ^{4} ( x )}{cos ^{2} ( x )}

= - sin (x) + \frac{sin ^{2} ( x ) - sin ^{4} ( x )}{cos ^{2} ( x )}

Convertir a fracción:

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

= - \frac{sin ( x ) cos ^{2} ( x )}{cos ^{2} ( x )} + \frac{sin ^{2} ( x ) - sin ^{4} ( x )}{cos ^{2} ( x )}

Ya que los denominadores son iguales, combinar las fracciones:

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

= \frac{- sin ( x ) cos ^{2} ( x ) + sin ^{2} ( x ) - sin ^{4} ( x )}{cos ^{2} ( x )}

= \frac{- cos ^{2} ( x ) sin ( x ) + sin ^{2} ( x ) - sin ^{4} ( x )}{cos ^{2} ( x )}

\frac{sin ^{2} ( x ) - sin ^{4} ( x ) - cos ^{2} ( x ) sin ( x )}{cos ^{2} ( x )} = 0

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

sin^{2} (x) - sin^{4} (x) - cos^{2} (x) sin (x) = 0

Factorizar

sin^{2} (x) - sin^{4} (x) - cos^{2} (x) sin (x) : sin (x) (sin (x) - sin^{3} (x) - cos^{2} (x))

sin^{2} (x) - sin^{4} (x) - cos^{2} (x) sin (x)

Aplicar las leyes de los exponentes:

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

sin^{4} (x) = sin (x) sin^{3} (x), sin^{2} (x) = sin (x) sin (x)

= sin (x) sin (x) - sin (x) sin^{3} (x) - sin (x) cos^{2} (x)

Factorizar el termino común

sin (x)

= sin (x) (sin (x) - sin^{3} (x) - cos^{2} (x))

sin (x) (sin (x) - sin^{3} (x) - cos^{2} (x)) = 0

Resolver cada parte por separado

sin (x) = 0 or sin (x) - sin^{3} (x) - cos^{2} (x) = 0

sin (x) = 0 : x = 2 πn, x = π + 2 πn

sin (x) = 0

Soluciones generales para

sin (x) = 0

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 = 0 + 2 πn, x = π + 2 πn

x = 0 + 2 πn, x = π + 2 πn

Resolver

x = 0 + 2 πn : x = 2 πn

x = 0 + 2 πn

0 + 2 πn = 2 πn

x = 2 πn

x = 2 πn, x = π + 2 πn

sin (x) - sin^{3} (x) - cos^{2} (x) = 0 : x = \frac{π}{2} + 2 πn, x = \frac{3 π}{2} + 2 πn

sin (x) - sin^{3} (x) - cos^{2} (x) = 0

Re-escribir usando identidades trigonométricas

- cos^{2} (x) + sin (x) - sin^{3} (x)

Utilizar la identidad pitagórica:

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

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

= - (1 - sin^{2} (x)) + sin (x) - sin^{3} (x)

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

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

Poner los parentesis

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

Aplicar las reglas de los signos

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

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

= - 1 + sin^{2} (x) + sin (x) - sin^{3} (x)

- 1 + sin (x) + sin^{2} (x) - sin^{3} (x) = 0

Usando el método de sustitución

- 1 + sin (x) + sin^{2} (x) - sin^{3} (x) = 0

Sea:

sin (x) = u

- 1 + u + u^{2} - u^{3} = 0

- 1 + u + u^{2} - u^{3} = 0 : u = 1, u = - 1

- 1 + u + u^{2} - u^{3} = 0

Escribir en la forma binómica

a_{n} x^{n} + \dots + a_{1} x + a_{0} = 0

- u^{3} + u^{2} + u - 1 = 0

Factorizar

- u^{3} + u^{2} + u - 1 : - (u - 1)^{2} (u + 1)

- u^{3} + u^{2} + u - 1

Factorizar el termino común

- 1

= - (u^{3} - u^{2} - u + 1)

Factorizar

u^{3} - u^{2} - u + 1 : (u - 1) (u + 1) (u - 1)

u^{3} - u^{2} - u + 1

= (u^{3} - u^{2}) + (- u + 1)

Factorizar

- 1

- u + 1

- (u - 1)

- u + 1

Factorizar el termino común

- 1

= - (u - 1)

Factorizar

u^{2}

u^{3} - u^{2}

u^{2} (u - 1)

u^{3} - u^{2}

Aplicar las leyes de los exponentes:

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

u^{3} = u u^{2}

= u u^{2} - u^{2}

Factorizar el termino común

u^{2}

= u^{2} (u - 1)

= - (u - 1) + u^{2} (u - 1)

Factorizar el termino común

u - 1

= (u - 1) (u^{2} - 1)

Factorizar

u^{2} - 1 : (u + 1) (u - 1)

u^{2} - 1

Reescribir

1

como

1^{2}

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

Aplicar la siguiente regla para binomios al cuadrado:

x^{2} - y^{2} = (x + y) (x - y)

u^{2} - 1^{2} = (u + 1) (u - 1)

= (u + 1) (u - 1)

= (u - 1) (u + 1) (u - 1)

= - (u - 1) (u + 1) (u - 1)

Simplificar

= - (u - 1)^{2} (u + 1)

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

Usando la propiedad del factor cero:

ab = 0

entonces

a = 0

b = 0

u - 1 = 0 or u + 1 = 0

Resolver

u - 1 = 0 : u = 1

u - 1 = 0

Desplace

1

a la derecha

u - 1 = 0

Sumar

1

a ambos lados

u - 1 + 1 = 0 + 1

Simplificar

u = 1

u = 1

Resolver

u + 1 = 0 : u = - 1

u + 1 = 0

Desplace

1

a la derecha

u + 1 = 0

Restar

1

de ambos lados

u + 1 - 1 = 0 - 1

Simplificar

u = - 1

u = - 1

Las soluciones son

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

Combinar toda las soluciones

x = 2 πn, x = π + 2 πn, 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

x = 2 πn, x = π + 2 πn

Gráfica

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