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Finding x when f'(x) = 0,

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From f(x)=(25e^-0.5x)(cos(x-0.464) + 6 Using product rule I have attained the derivative f'(x)= (-12.5e^-0.5x)(cos(x-0.464)) + (25e^-0.5x)(-sin(x-0.464)) When f'(x) = 0, how do I find x?

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