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

यदि y = cos x ⋅ cos 4x ⋅ cos 8x हो तो  \(\rm x = \frac{\pi}{4}\) पर \(\rm \frac{1}{y}\frac{dy}{dx}\) किसके बराबर है?

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