MCQ
समीकरण $\frac{d y}{d x}=\cos ^2 y$ का हल है-
  • A
    $x+\tan y=c$
  • $\tan y=x+c$
  • C
    $\sin y+x=c$
  • D
    $\sin y-x=c$

Answer

Correct option: B.
$\tan y=x+c$
(B) $\tan y=x+c$
$\frac{d y}{d x}=\cos ^2 y$
$\Rightarrow \frac{1}{\cos ^2 y} d y=d x \Rightarrow \sec ^2 y d y=d x$
इसलिए $\int \sec ^2 y d y=\int d x$
$\tan y=x+c$
अतः सही विकल्प (B) है।

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