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

If y = cos x ⋅ cos 4x ⋅ cos 8x, then what is \(\rm \frac{1}{y}\frac{dy}{dx}\) at \(\rm x = \frac{\pi}{4}\) equal to?

1

-1

2

0

3

1

4

3

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