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Write the expression as either the sine, cosine, or tangent of a single angle.
cos pi/3 cos pi/5 + sin pi/3 sin pi/5
 one year ago
 one year ago
Write the expression as either the sine, cosine, or tangent of a single angle. cos pi/3 cos pi/5 + sin pi/3 sin pi/5
 one year ago
 one year ago

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stgreenBest ResponseYou've already chosen the best response.2
use the identity: cos (ab)=cos a cos b +sin a sin b
 one year ago

n14r96Best ResponseYou've already chosen the best response.0
but how do u use that to solve it
 one year ago

stgreenBest ResponseYou've already chosen the best response.2
in this case you have a=pi/3 and b=pi/5 lets say then cos pi/3 cos pi/5 + sin pi/3 sin pi/5=cos (pi/3  pi/5)=cos (2pi/15)=cos(2pi/15) you could've different answers due to periodicity..but all are same in numeric value
 one year ago
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