Evaluate `intsin2xsin3xdx`.

Explanation

To evaluate the integral \( \int \sin 2x \sin 3x \, dx \), we can follow these steps:

### Step 1: Multiply and divide by 2
We start by multiplying and dividing the integral by 2:
\[ \int \sin 2x \sin 3x \, dx = \frac{1}{2} \int 2 \sin 2x \sin 3x \, dx \]

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