# If <a name="MTBla

For ,

y=sin-1 (sin x)

= sin-1 ( sin (π –(π -x))

(to get y in principal range of sin-1 x)

i.e.,

y = π - x From the last problem we see that and So, y is not differentiable at Extending this, we can say that y is not differentiable at x = (2n+1) So, for  (Ans)

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