Teaching UP TGT Mock Test Series 2025 Mathematics Differential Calculus Evaluation of derivatives

If y = |cos x - sin x|, then \(\frac{{dy}}{{dx}}\) at \(x = \frac{\pi }{4}\) is

1
\( - \sqrt 2 \)
2
\(\sqrt 2 \)
3
0
4
Not defined 
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