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| Math Central | Quandaries & Queries |
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Question from Odukoya, a student: How can I express Sin 4A in term of Sin A? |
Hi,
Write $B = 2A$ and expand $\sin 4A = \sin 2B$ using the double angle formula for $\sin 2B.$ Write this in terms of $A$ and expand $\sin 2A$ and $\cos 2A$ again using the double angle formulae. Can you complete the problem now?
Write back if you need more assistance,
Penny
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