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

यदि \(\rm y = \tan^{-1} \left( \frac{\sin x}{1 + \cos x} \right) \) तो \(\rm \frac{dy}{dx}\) किसके बराबर है?

1
1/4
2
1/2
3
1 + cos2x
4
-1/4
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