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Popular >

cos^2(x)-cos(2x)=0

Solución

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

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) - cos (2 x) = 0

Re-escribir usando identidades trigonométricas

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

Utilizar la identidad trigonométrica del ángulo doble:

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

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

= - cos (2 x) + cos (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

sin^2(θ)=(cos^2(θ)-1)/2

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

tan (x) = \frac{3}{10}

solvefor y=1+sin((pix)/4),x resolver para

y = 1 + sin (\frac{π x}{4}), x

sec (\frac{x}{2}) = 2

arccos(2x)+arccos(x)= pi/3

arccos (2 x) + arccos (x) = \frac{π}{3}