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Differential Equations

Oswaal

CBSE

Grade 12

Question:

Integrating factor of $\cos x \dfrac{dy}{dx} + y \sin x = 1$ is:
(a) $\sec x$
(b) $\cos x$
(c) $\sin x$
(d) $\tan x$

Step-by-Step Solution

Key Concept: dy/dx + y tan x = sec x => IF = e^{\int tan x dx} = sec x.

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Correct Answer: $\sec x$

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