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Evaluate: (i) intxsin3x\ dx (ii) intxsec...

Evaluate: (i) `intxsin3x\ dx` (ii) `intxsec^2x\ dx`

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Let's evaluate the given integrals step by step. ### Part (i): Evaluate \(\int x \sin 3x \, dx\) 1. **Identify the functions for integration by parts**: We will use the integration by parts formula: \[ \int u \, dv = uv - \int v \, du ...
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