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Question

What is the formula for sin3x?


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Solution

Determine the formula of sin3x.

It is known that sin3x=3sinx-4sin3x.

Rearrange the terms.

4sin3x=3sinx-sin3xโ‡’sin3x=3sinx-sin3x4

Therefore, the formula is sin3x=3sinx-sin3x4.


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