Find the exact values of the sine and cosine of the angle by using a sum or difference formula.
sin(60 +45)
cos(60+45)
I have the formulas:
sin(u+v) = sinu cosv + cosu sinv
sin(u-v) = sinu cosv - cosu sinv
cos(u+v) = cosu cosv - sinu sinv
cos(u-v) = cosu cosv + sinu sinv

Question

Find the exact values of the sine and cosine of the angle by using a sum or difference formula.
sin(60 +45)
cos(60+45)
I have the formulas: 
sin(u+v) = sinu cosv + cosu sinv
sin(u-v) = sinu cosv - cosu sinv
cos(u+v) = cosu cosv - sinu sinv 
cos(u-v) = cosu cosv + sinu sinv

jdoe0001 · Answer

yeap, those are the identities you'd need, the sum/difference ones

jdoe0001 · Answer

60 and 45 degrees are well known angles, so those would be in your Unit Circle

anonymous · Answer

Yeah. I can't get all the way to the answer
I can get far into the equation but I can't get all the way to the answer

jdoe0001 · Answer

you mean... you dunno the sine and cosine for 60 and 45 degrees?

anonymous · Answer

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