Q.If $f(x) = |\cos x| + |\sin x|$ , then $f$ is

differentiable everywhere

not differentiable at

x = k\pi/2

not differentiable at

x = k\pi

differentiable except at

x = \pi/4 + k\pi

The correct solution involves applying the fundamental concept to derive the final value step by step...

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Q.If f(x)=∣cos⁡x∣+∣sin⁡x∣f(x) = |\cos x| + |\sin x|f(x)=∣cosx∣+∣sinx∣, then fff is