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For f(x)=4cos⁡2x−sin⁡xf(x)=4 \cos ^{2} x-\sin x And 0≤x≤π0 \leq x \leq \pi

question 90

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For f(x)=4cos⁡2x−sin⁡xf(x)=4 \cos ^{2} x-\sin x and 0≤x≤π0 \leq x \leq \pi , what is the global maximum value of f(x)f(x) ?

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