Question
Evaluate:
$\int \frac{\sin 2 x}{\cos x} \cdot d x$
✓
Answer
$\begin{aligned} \int \frac{\sin 2 x}{\cos x} d x & =\int \frac{2 \sin x \cos x}{\cos x} d x \\ & =2 \int \sin x d x \\ & =-2 \cos x+c .\end{aligned}$
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