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On which interval is the function f(x) = 3 sin(2x) decreasing?Responses

Question

On which interval is the function f(x) = 3 sin(2x) decreasing?Responses

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Solution

Para determinar en qué intervalo la función f(x)=3sin(2x) f(x) = 3 \sin(2x) está decreciendo, debemos seguir estos pasos:

  1. Encontrar la derivada de la función: La derivada de f(x)=3sin(2x) f(x) = 3 \sin(2x) con respecto a x x es: f(x)=3ddx[sin(2x)]=32cos(2x)=6cos(2x) f'(x) = 3 \cdot \frac{d}{dx}[\sin(2x)] = 3 \cdot 2 \cos(2x) = 6 \cos(2x)

  2. Determinar cuándo la derivada es negativa: La función f(x) f(x) está decreciendo cuando su derivada es negativa, es decir, cuando f(x)<0 f'(x) < 0 : 6cos(2x)<0 6 \cos(2x) < 0 Simplificando, obtenemos: cos(2x)<0 \cos(2x) < 0

  3. Encontrar los valores de x x para los cuales cos(2x)<0 \cos(2x) < 0 : La función cos(2x) \cos(2x) es negativa en los intervalos donde el ángulo 2x 2x está en los cuadrantes segundo y tercero del círculo unitario. Esto ocurre cuando: π2<2x<3π2 \frac{\pi}{2} < 2x < \frac{3\pi}{2} Dividiendo todo por 2 para resolver para x x : π4<x<3π4 \frac{\pi}{4} < x < \frac{3\pi}{4}

  4. Generalizar para todos los ciclos de la función seno: La función seno es periódica con un período de π \pi para 2x 2x , lo que significa que debemos considerar todos los intervalos donde cos(2x) \cos(2x) es negativo. Esto se puede expresar como: π4+kπ<x<3π4+kπpara cualquier entero k \frac{\pi}{4} + k\pi < x < \frac{3\pi}{4} + k\pi \quad \text{para cualquier entero } k

Por lo tanto, la función f(x)=3sin(2x) f(x) = 3 \sin(2x) está decreciendo en los intervalos: (π4+kπ,3π4+kπ)para cualquier entero k \left( \frac{\pi}{4} + k\pi, \frac{3\pi}{4} + k\pi \right) \quad \text{para cualquier entero } k

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