Question

In order to solve the differential equation $x \cos x \frac{d y}{d x}+y(x \sin x+\cos x)=1$ the integrating factor is:

• A. $x\, \cos x$
• B. $x\, \sec x$
• C. $x\, \sin x$
• D. $x\, \text{cosec} x$

Answer 1

Answer: (B)

$x\, \sec x$

Answer 2

Answer (b) $x\, \sec x$