$$
Simplifying the numerator, we get
$$
\frac{\sin x+\sin^2 x+\cos^2 x}{\cos x(1+\sin x)}.
$$
Since $\sin^2 x+\cos^2 x=1$, this simplifies to
$$
\frac{1+\sin x}{\cos x}=\frac{1}{\cos x}+\frac{\sin x}{\cos x}=\sec x+\tan x=\sec x.
$$
So, we have proved the
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