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

यदि y = |cos x - sin x| है, तब \(x = \frac{\pi }{4}\) पर \(\frac{{dy}}{{dx}}\) है:

1
\( - \sqrt 2 \)
2
\(\sqrt 2 \)
3
0
4
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