Solve the following differential equation: `(dy)/(dx)-ytanx=e^xsecx`

Explanation

It is given, `\frac{d y}{d x}-y \tan x=e^{\pi} \sec x`

It is a first-degree linear D.E of the form
$$ \frac{d y}{d x}+P y=Q $$
here `P=-\tan x \quad\text{and} \quad Q=e^{x} \sec x`
$$
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...