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OpenStudy (anonymous):
cos(2y)cos(y) - sin(2y)sin(y)
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OpenStudy (dan815):
try some other trig identities in there if that doesnt simplify it
OpenStudy (anonymous):
so would it be cos2A * sin2A - 2 sinA * cosA?
OpenStudy (dan815):
it will simplify to cos(3y)
OpenStudy (anonymous):
just plug it in ur calc matway.com is a great one .... cos(3y)
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OpenStudy (dan815):
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