Evaluate: (i) `int(sin2x)/(acos^2x+bsin^2x)\ dx` (ii) `int(cosx)/(2+3sinx)\ dx`

Explanation

Let's solve the integrals step by step.

### (i) Evaluate the integral:
\[ \int \frac{\sin 2x}{A \cos^2 x + B \sin^2 x} \, dx \]

**Step 1: Substitution**
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