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OpenStudy (anonymous):
so my problem is: cos(-pi/12) and i change it to cos2(-pi/6)=2sin(-pi/6)cos(-pi/6) and i end up with (-root6/4) and i keep getting told that the answer is wrong. Any hints on what i should do?/:
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OpenStudy (anonymous):
you are using wrong double angel formula for cos(2x)
OpenStudy (anonymous):
oh wow. the stress is really hitting me hard this time lol. thank you!:)
OpenStudy (anonymous):
no prob
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