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1-2cos^2(8x)=sin(4x)

Solución

1 - 2 cos^{2} (8 x) = sin (4 x)

Solución

x = \frac{3 π + 4 πn}{8}, x = \frac{π + 12 πn}{24}, x = \frac{5 π + 12 πn}{24}, x = \frac{0.94247 \dots + 2 πn}{4}, x = \frac{π - 0.94247 \dots + 2 πn}{4}, x = \frac{- 0.31415 \dots + 2 πn}{4}, x = \frac{π + 0.31415 \dots + 2 πn}{4}

+1

Pasos de solución

1 - 2 cos^{2} (8 x) = sin (4 x)

Restar

sin (4 x)

de ambos lados

1 - 2 cos^{2} (8 x) - sin (4 x) = 0

Sea:

u = 4 x

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

Re-escribir usando identidades trigonométricas

- 1 - sin (u) + 8 sin^{2} (u) - 8 sin^{4} (u) = 0

Usando el método de sustitución

sin (u) = - 1, sin (u) = \frac{1}{2}, sin (u) = \frac{1 + 5}{4}, sin (u) = \frac{1 - 5}{4}

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

sin (u) = \frac{1}{2} : u = \frac{π}{6} + 2 πn, u = \frac{5 π}{6} + 2 πn

sin (u) = \frac{1 + 5}{4} : u = arcsin (\frac{1 + 5}{4}) + 2 πn, u = π - arcsin (\frac{1 + 5}{4}) + 2 πn

sin (u) = \frac{1 - 5}{4} : u = arcsin (\frac{1 - 5}{4}) + 2 πn, u = π + arcsin (- \frac{1 - 5}{4}) + 2 πn

Combinar toda las soluciones

u = \frac{3 π}{2} + 2 πn, u = \frac{π}{6} + 2 πn, u = \frac{5 π}{6} + 2 πn, u = arcsin (\frac{1 + 5}{4}) + 2 πn, u = π - arcsin (\frac{1 + 5}{4}) + 2 πn, u = arcsin (\frac{1 - 5}{4}) + 2 πn, u = π + arcsin (- \frac{1 - 5}{4}) + 2 πn

Sustituir en la ecuación

u = 4 x

4 x = \frac{3 π}{2} + 2 πn : x = \frac{3 π + 4 πn}{8}

4 x = \frac{π}{6} + 2 πn : x = \frac{π + 12 πn}{24}

4 x = \frac{5 π}{6} + 2 πn : x = \frac{5 π + 12 πn}{24}

4 x = arcsin (\frac{1 + 5}{4}) + 2 πn : x = \frac{arcsin ( \frac{1 + 5}{4} ) + 2 πn}{4}

4 x = π - arcsin (\frac{1 + 5}{4}) + 2 πn : x = \frac{π - arcsin ( \frac{1 + 5}{4} ) + 2 πn}{4}

4 x = arcsin (\frac{1 - 5}{4}) + 2 πn : x = \frac{arcsin ( \frac{1 - 5}{4} ) + 2 πn}{4}

4 x = π + arcsin (- \frac{1 - 5}{4}) + 2 πn : x = \frac{π + arcsin ( \frac{5 - 1}{4} ) + 2 πn}{4}

x = \frac{3 π + 4 πn}{8}, x = \frac{π + 12 πn}{24}, x = \frac{5 π + 12 πn}{24}, x = \frac{arcsin ( \frac{1 + 5}{4} ) + 2 πn}{4}, x = \frac{π - arcsin ( \frac{1 + 5}{4} ) + 2 πn}{4}, x = \frac{arcsin ( \frac{1 - 5}{4} ) + 2 πn}{4}, x = \frac{π + arcsin ( \frac{5 - 1}{4} ) + 2 πn}{4}

Mostrar soluciones en forma decimal

x = \frac{3 π + 4 πn}{8}, x = \frac{π + 12 πn}{24}, x = \frac{5 π + 12 πn}{24}, x = \frac{0.94247 \dots + 2 πn}{4}, x = \frac{π - 0.94247 \dots + 2 πn}{4}, x = \frac{- 0.31415 \dots + 2 πn}{4}, x = \frac{π + 0.31415 \dots + 2 πn}{4}

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