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Mathematics 9 Online
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

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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