1.

Let S be the set of all points in (-π, π) at which the function, f(x) = min (sin x, cos x) is not differentiable. Then, S is a subset of which of the following

A. \(\left\{ -\frac{\pi }{4},0,\text{ }\!\!~\!\!\text{ }\frac{\pi }{4} \right\}\)
B. \(\left\{ -\frac{\pi }{2},-\frac{\pi }{4},\frac{\pi }{4},\frac{\pi }{2} \right\}\)
C. \(\left\{ -\frac{3\pi }{4},-\frac{\pi }{4},\frac{3\pi }{4},\frac{\pi }{4} \right\}\)
D. \(\left\{ -\frac{3\pi }{4},-\frac{\pi }{2},\frac{\pi }{2},\frac{3\pi }{4} \right\}\)
Answer» D. \(\left\{ -\frac{3\pi }{4},-\frac{\pi }{2},\frac{\pi }{2},\frac{3\pi }{4} \right\}\)


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