If , then is equal…

MATHEMATICS · Single correct · CBSE · Mathematics · Continuity and Differentiability · Continuity and Differentiability

Problem

If

f(x)=|\cos x-\sin x|

, then

f'\left(\frac{\pi}{4}\right)

is equal to (1)

\sqrt{2}

(2)

-\sqrt{2}

(3) 0 (4) None of these

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