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Question: Answered & Verified by Expert
If $y=\log _{\cos x} \sin x$, then $\frac{d y}{d x}$ is equal to
MathematicsDifferentiationJEE Main
Options:
  • A $\frac{(\cot x \log \cos x+\tan x \log \sin x)}{(\log \cos x)^{2}}$
  • B $\frac{(\tan x \log \cos x+\cot x \log \sin x)}{(\log \cos x)^{2}}$
  • C $\frac{(\cot x \log \cos x+\tan x \log \sin x)}{(\log \sin x)^{2}}$
  • D None of the above
Solution:
1190 Upvotes Verified Answer
The correct answer is: $\frac{(\cot x \log \cos x+\tan x \log \sin x)}{(\log \cos x)^{2}}$
Given, $y=\log _{\cos x} \sin x=\frac{\log \sin x}{\log \cos x}$
On differentiating w.r.t. $x$, we get
$$
\frac{d y}{d x}=\frac{\cot x \cdot \log \cos x+\tan x \cdot \log \sin x}{(\log \cos x)^{2}}
$$

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