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OpenStudy (lilsis76):
us addition formulas for Sin & Cos to simplify the expressions. instructors instruction: LET S=45, T=30 cos 2u cos 3u - sin 2u sin 3u
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OpenStudy (lilsis76):
I know for cosine its..... cos(s+t)=cos S cos T - sin S cos T does that mean i have to put the 2u or just a 2?
OpenStudy (lilsis76):
oh im sorry UGH! dumb teacher instructions. since S is 45 and T is 30....i fill those in? Am i trying to find cos and sin? or just sin?
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