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Q) Show that the function f(x) = sin x + cos x is strictly decreasing in the interval ( ( 𝜋)/4

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Q) Determine for what values of x, the function f(x) = x^4 - x^3 /3is strictly increasing or strict

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Q) Determine for what values of x, the function f(x) = x^4 - x^3 /3is strictly increasing or strict