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Please solve RD Sharma class 12 chapter 9 Differentiability exercise Fill in the blanks question  13 maths textbook solution

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Answer: f(x)=\cos |x| is differentiable at set of R

Given: f(x)=\cos |x|


The function f(x)=\cos |x| is differentiable everywhere except at points where x=\left(k+\frac{1}{2}\right) \pi    where k is an integer. 

Hence, f(x)=\cos |x| is differentiable at set of R.

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