## anonymous one year ago I am stuck on this problem Verify the identity: sin4t=2sin2tcos2t

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1. butterflydreamer

hint: $\sin2t = 2sintcost$

2. butterflydreamer

^ that's a double angle formula :)

3. UsukiDoll

so sin4t must be the doubled version of the double angle formula.

4. butterflydreamer

exactly :)!

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