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int cos 3x dx...

`int cos 3x dx`

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To solve the integral \( \int \cos(3x) \, dx \), we will use substitution. Here are the steps: ### Step-by-Step Solution: 1. **Let \( t = 3x \)**: - We will substitute \( t \) for \( 3x \) to simplify the integral. **Hint**: Choose a substitution that simplifies the argument of the cosine function. ...
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