Number of points of non diffrentiability of will be
As we have learned
Properties of differentiable functions -
The sum, difference, product and quotient of two differentiable functions is differentiable.
f(x) is sum of a polynomial , sin x and cos x . Individually all of them are diffrentiable
So there sum will also be diffrentiable
number of points of non diffrentiablity = zero
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