hardequalsmath
cos(2y)cos(y)  sin(2y)sin(y)



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dan815
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try some other trig identities in there if that doesnt simplify it

hardequalsmath
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so would it be cos2A * sin2A  2 sinA * cosA?

dan815
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it will simplify to cos(3y)

hayden4290
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just plug it in ur calc matway.com is a great one .... cos(3y)

dan815
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dw:1373582879587:dw

hardequalsmath
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thanks