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Differentiation to Solve Modified Sum of Binomial Coefficients

39. Prove tha...

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39. Prove that the function given by f(x)=cosx is strictly increasing in (pi,2pi).

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Q. Prove that the function given by

f (x) = cos x

is strictly increasing in

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f (x) = cos x

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(i) strictly decreasing in (0, π)
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