Question

Total number of points belonging to (0, 2π) where f(x) = max. {sin x . cos x, 1 – cos x} is not differentiable, is equal to

• A. 3
• B. 4
• C. 5
• D. 6

Answer 1

Answer: (A)

3

Answer 2

Max. {sin x, cos x, 1 – cos x}

Not differentiable at x = π/4, π/2, $\frac { 5 \pi } { 3 }$ three points.