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Popular Trigonometría >

cos^2(x)=sin^2(x)-(sqrt(2))/2

Solución

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

Solución

x = 1.17809 \dots + 2 πn, x = π - 1.17809 \dots + 2 πn, x = - 1.17809 \dots + 2 πn, x = π + 1.17809 \dots + 2 πn

Grados

x = 67. 5^{\circ} + 36 0^{\circ} n, x = 112. 5^{\circ} + 36 0^{\circ} n, x = - 67. 5^{\circ} + 36 0^{\circ} n, x = 247. 5^{\circ} + 36 0^{\circ} n

Pasos de solución

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

Restar

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

de ambos lados

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

Simplificar

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

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

Convertir a fracción:

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

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

Ya que los denominadores son iguales, combinar las fracciones:

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

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

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

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

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

Re-escribir usando identidades trigonométricas

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

Utilizar la identidad pitagórica:

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

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

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

Simplificar

1 + (1 - sin^{2} (x)) 2 - sin^{2} (x) 2 : 1 + 2 - 22 sin^{2} (x)

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

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

Expandir

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

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

Poner los parentesis utilizando:

a (b - c) = ab - a c

a = 2, b = 1, c = sin^{2} (x)

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

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

Multiplicar:

1 \cdot 2 = 2

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

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

Sumar elementos similares:

- 2 sin^{2} (x) - 2 sin^{2} (x) = - 22 sin^{2} (x)

= 1 + 2 - 22 sin^{2} (x)

= 1 + 2 - 22 sin^{2} (x)

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

Usando el método de sustitución

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

Sea:

sin (x) = u

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

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

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

Desplace

1

a la derecha

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

Restar

1

de ambos lados

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

Simplificar

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

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

Desplace

2

a la derecha

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

Restar

2

de ambos lados

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

Simplificar

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

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

Dividir ambos lados entre

- 22

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

Dividir ambos lados entre

- 22

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

Simplificar

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

Simplificar

\frac{- 2 u ^{2} 2}{- 2 2} : u^{2}

\frac{- 2 u ^{2} 2}{- 2 2}

Aplicar las propiedades de las fracciones:

\frac{- a}{- b} = \frac{a}{b}

= \frac{2 u ^{2} 2}{2 2}

Dividir:

\frac{2}{2} = 1

= \frac{2 u ^{2}}{2}

Eliminar los terminos comunes:

2

= u^{2}

Simplificar

- \frac{1}{- 2 2} - \frac{2}{- 2 2} : \frac{2 + 2}{4}

- \frac{1}{- 2 2} - \frac{2}{- 2 2}

Aplicar la regla

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

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

Aplicar las propiedades de las fracciones:

\frac{- a}{- b} = \frac{a}{b}

- 1 - 2 = - (1 + 2)

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

Racionalizar

\frac{1 + 2}{2 2} : \frac{2 + 2}{2 ^{2}}

\frac{1 + 2}{2 2}

Multiplicar por el conjugado

\frac{2}{2}

= \frac{( 1 + 2 ) 2}{2 2 2}

(1 + 2) 2 = 2 + 2

(1 + 2) 2

= 2 (1 + 2)

Poner los parentesis utilizando:

a (b + c) = ab + a c

a = 2, b = 1, c = 2

= 2 \cdot 1 + 22

= 1 \cdot 2 + 22

Simplificar

1 \cdot 2 + 22 : 2 + 2

1 \cdot 2 + 22

Multiplicar:

1 \cdot 2 = 2

= 2 + 22

Aplicar las leyes de los exponentes:

a a = a

22 = 2

= 2 + 2

= 2 + 2

222 = 2^{2}

222

Aplicar las leyes de los exponentes:

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

222 = 2 \cdot 2^{\frac{1}{2}} \cdot 2^{\frac{1}{2}} = 2^{1 + \frac{1}{2} + \frac{1}{2}}

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

Sumar elementos similares:

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

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

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

2 \cdot \frac{1}{2}

Multiplicar fracciones:

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

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

Eliminar los terminos comunes:

2

= 1

= 2^{1 + 1}

Sumar:

1 + 1 = 2

= 2^{2}

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

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

2^{2} = 4

= \frac{2 + 2}{4}

u^{2} = \frac{2 + 2}{4}

u^{2} = \frac{2 + 2}{4}

u^{2} = \frac{2 + 2}{4}

Para

x^{2} = f (a)

las soluciones son

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

u = \frac{2 + 2}{4}, u = - \frac{2 + 2}{4}

\frac{2 + 2}{4} = \frac{2 + 2}{2}

\frac{2 + 2}{4}

Aplicar la siguiente propiedad de los radicales:

asumiendo que

a \geq 0, b \geq 0

= \frac{2 + 2}{4}

4 = 2

4

Descomponer el número en factores primos:

4 = 2^{2}

= 2^{2}

Aplicar las leyes de los exponentes:

2^{2} = 2

= 2

= \frac{2 + 2}{2}

- \frac{2 + 2}{4} = - \frac{2 + 2}{2}

- \frac{2 + 2}{4}

Simplificar

\frac{2 + 2}{4} : \frac{2 + 2}{2}

\frac{2 + 2}{4}

Aplicar la siguiente propiedad de los radicales:

asumiendo que

a \geq 0, b \geq 0

= \frac{2 + 2}{4}

4 = 2

4

Descomponer el número en factores primos:

4 = 2^{2}

= 2^{2}

Aplicar las leyes de los exponentes:

2^{2} = 2

= 2

= \frac{2 + 2}{2}

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

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

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

Sustituir en la ecuación

u = sin (x)

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

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

sin (x) = \frac{2 + 2}{2} : x = arcsin (\frac{2 + 2}{2}) + 2 πn, x = π - arcsin (\frac{2 + 2}{2}) + 2 πn

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

Aplicar propiedades trigonométricas inversas

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

Soluciones generales para

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

sin (x) = a \Rightarrow x = arcsin (a) + 2 πn, x = π - arcsin (a) + 2 πn

x = arcsin (\frac{2 + 2}{2}) + 2 πn, x = π - arcsin (\frac{2 + 2}{2}) + 2 πn

x = arcsin (\frac{2 + 2}{2}) + 2 πn, x = π - arcsin (\frac{2 + 2}{2}) + 2 πn

sin (x) = - \frac{2 + 2}{2} : x = arcsin (- \frac{2 + 2}{2}) + 2 πn, x = π + arcsin (\frac{2 + 2}{2}) + 2 πn

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

Aplicar propiedades trigonométricas inversas

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

Soluciones generales para

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

sin (x) = - a \Rightarrow x = arcsin (- a) + 2 πn, x = π + arcsin (a) + 2 πn

x = arcsin (- \frac{2 + 2}{2}) + 2 πn, x = π + arcsin (\frac{2 + 2}{2}) + 2 πn

x = arcsin (- \frac{2 + 2}{2}) + 2 πn, x = π + arcsin (\frac{2 + 2}{2}) + 2 πn

Combinar toda las soluciones

x = arcsin (\frac{2 + 2}{2}) + 2 πn, x = π - arcsin (\frac{2 + 2}{2}) + 2 πn, x = arcsin (- \frac{2 + 2}{2}) + 2 πn, x = π + arcsin (\frac{2 + 2}{2}) + 2 πn

Mostrar soluciones en forma decimal

x = 1.17809 \dots + 2 πn, x = π - 1.17809 \dots + 2 πn, x = - 1.17809 \dots + 2 πn, x = π + 1.17809 \dots + 2 πn

Gráfica

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