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Popular >

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

Solución

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

Solución

x = 2 πn, x = π + 2 πn

+1

Grados

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

Pasos de solución

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

Restar

1 - 2 sin^{2} (x)

de ambos lados

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

Re-escribir usando identidades trigonométricas

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

Utilizar la identidad pitagórica:

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

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

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

Simplificar

= sin^{2} (x)

sin^{2} (x) = 0

Aplicar la regla

x^{n} = 0 \Rightarrow x = 0

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

Ejemplos populares

(1+tanh(x))/(1-tanh(x))=2

\frac{1 + tanh ( x )}{1 - tanh ( x )} = 2

2sin^2(θ)+5sin(θ)-3=0

2 sin^{2} (θ) + 5 sin (θ) - 3 = 0

sin(2x)-sin(x)=0,-pi<= x<= pi

sin (2 x) - sin (x) = 0, - π \leq x \leq π

2(tan(x)+3)=5+tan(x)

2 (tan (x) + 3) = 5 + tan (x)

3 cos (4 θ) = - 2