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linshan789
 one year ago
Best ResponseYou've already chosen the best response.0dw:1361641769890:dw

sirm3d
 one year ago
Best ResponseYou've already chosen the best response.0use the identity \[\frac{1}{2}\cos(AB)\cos(A+B)=\cos(A)\cos(B)\]

TuringTest
 one year ago
Best ResponseYou've already chosen the best response.0\[\frac{1}{2}[\cos(AB)+\cos(A+B)]=\cos(A)\cos(B)\]

linshan789
 one year ago
Best ResponseYou've already chosen the best response.0Isn't that an identity for sin? Is it the same for cos?

TuringTest
 one year ago
Best ResponseYou've already chosen the best response.0there are 4 essential sum to product formulas http://tutorial.math.lamar.edu/pdf/Trig_Cheat_Sheet.pdf
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