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For which interval the given function fx=-2x3-9x2-12x+1 is decreasing?

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Important Questions on Application of Derivatives

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Rolle's theorem is not applicable for the function f(x)=|x| in the interval [-1,1] because
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If the curve y=ax and y=bx intersect at angle α, then tanα is equal to
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The maximum value of f(x)=x+sin2x,x[0,2π] is