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OpenStudy (anonymous):
I am stuck on this problem Verify the identity: sin4t=2sin2tcos2t
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OpenStudy (butterflydreamer):
hint: \[\sin2t = 2sintcost\]
OpenStudy (butterflydreamer):
^ that's a double angle formula :)
OpenStudy (usukidoll):
so sin4t must be the doubled version of the double angle formula.
OpenStudy (butterflydreamer):
exactly :)!
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