Question
समीकरण $\frac{d y}{d x}+\cos x \cdot \tan y=0$ का हल है-

Answer

(A) $\log \sin y+\sin x=c$
$\frac{d y}{d x}+\cos x \cdot \tan y=0$
$\Rightarrow \quad \frac{d y}{d x}=-\cos x \cdot \tan y$
$\Rightarrow \quad \frac{d y}{\tan y}=-\cos x d x$
या $\cot y d y=-\cos x d x$
इसलिए $\int \cot y d y=-\int \cos x d x$
$\log \sin y=-\sin x+c$
$\Rightarrow \quad \log \sin y+\sin x=c$
अतः सही विकल्प (A) है।

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