JEE Main 2019 — Math solution | Fundamenthol

JEE Main2019Math

Q.

Let S be the set of all points in $(- π, π)$ at which the function, f(x) = min {sinx, cosx} is not differentiable. Then S is a subset of which of the following?

A
${- \frac{3 π}{4}, - \frac{π}{4}, \frac{3 π}{4}, \frac{π}{4}}$
B
${- \frac{3 π}{4}, - \frac{π}{2}, \frac{π}{2}, \frac{3 π}{4}}$
C
${- \frac{π}{2}, - \frac{π}{4}, \frac{π}{4}, \frac{π}{2}}$
D
${- \frac{π}{4}, 0 \frac{π}{4}}$

Solution

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