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Given that f(1) = 2, f'(1) = -1, g(1) = 0, and g'(1) = 1. If F(x) = f(x) cos cos (g (x)), then the value of F'(1) is?"

Question

Given that f(1) = 2, f'(1) = -1, g(1) = 0, and g'(1) = 1. If F(x) = f(x) cos cos (g (x)), then the value of F'(1) is?"

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Solution

Para encontrar el valor de F(1) F'(1) , primero necesitamos aplicar la regla del producto y la regla de la cadena a la función F(x)=f(x)cos(cos(g(x))) F(x) = f(x) \cos(\cos(g(x))) .

Primero, recordemos que la derivada de un producto de dos funciones u(x) u(x) y v(x) v(x) es: (uv)=uv+uv (uv)' = u'v + uv'

En este caso, u(x)=f(x) u(x) = f(x) y v(x)=cos(cos(g(x))) v(x) = \cos(\cos(g(x))) .

Entonces, la derivada de F(x) F(x) es: F(x)=f(x)cos(cos(g(x)))+f(x)ddx[cos(cos(g(x)))] F'(x) = f'(x) \cos(\cos(g(x))) + f(x) \frac{d}{dx}[\cos(\cos(g(x)))]

Ahora, necesitamos encontrar la derivada de cos(cos(g(x))) \cos(\cos(g(x))) usando la regla de la cadena. Sea h(x)=cos(g(x)) h(x) = \cos(g(x)) , entonces: ddx[cos(h(x))]=sin(h(x))h(x) \frac{d}{dx}[\cos(h(x))] = -\sin(h(x)) \cdot h'(x)

Y la derivada de h(x)=cos(g(x)) h(x) = \cos(g(x)) es: h(x)=sin(g(x))g(x) h'(x) = -\sin(g(x)) \cdot g'(x)

Por lo tanto: ddx[cos(cos(g(x)))]=sin(cos(g(x)))(sin(g(x))g(x)) \frac{d}{dx}[\cos(\cos(g(x)))] = -\sin(\cos(g(x))) \cdot (-\sin(g(x)) \cdot g'(x)) =sin(cos(g(x)))sin(g(x))g(x) = \sin(\cos(g(x))) \cdot \sin(g(x)) \cdot g'(x)

Ahora, sustituyamos esto en la derivada de F(x) F(x) : F(x)=f(x)cos(cos(g(x)))+f(x)sin(cos(g(x)))sin(g(x))g(x) F'(x) = f'(x) \cos(\cos(g(x))) + f(x) \sin(\cos(g(x))) \cdot \sin(g(x)) \cdot g'(x)

Finalmente, evaluamos en x=1 x = 1 : F(1)=f(1)cos(cos(g(1)))+f(1)sin(cos(g(1)))sin(g(1))g(1) F'(1) = f'(1) \cos(\cos(g(1))) + f(1) \sin(\cos(g(1))) \cdot \sin(g(1)) \cdot g'(1)

Dado que f(1)=2 f(1) = 2 , f(1)=1 f'(1) = -1 , g(1)=0 g(1) = 0 , y g(1)=1 g'(1) = 1 , sustituimos estos valores: F(1)=(1)cos(cos(0))+2sin(cos(0))sin(0)1 F'(1) = (-1) \cos(\cos(0)) + 2 \sin(\cos(0)) \cdot \sin(0) \cdot 1

Sabemos que cos(0)=1 \cos(0) = 1 y sin(0)=0 \sin(0) = 0 , entonces: F(1)=(1)cos(1)+2sin(1)01 F'(1) = (-1) \cos(1) + 2 \sin(1) \cdot 0 \cdot 1 =cos(1)+0 = -\cos(1) + 0 =cos(1) = -\cos(1)

Por lo tanto, el valor de F(1) F'(1) es cos(1) -\cos(1) .

This problem has been solved

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