SOLUTION: Prove that:
(sin a cos b+cos a sin b)^2+(cos a cos b-sin a sin b)^2 = 1
Algebra.Com
Question 1116833: Prove that:
(sin a cos b+cos a sin b)^2+(cos a cos b-sin a sin b)^2 = 1
Answer by solver91311(24713) (Show Source): You can put this solution on YOUR website!
One term of the LHS is )
and the other is )
. So let \ =\ \varphi)
, and 
, Q.E.D
John
My calculator said it, I believe it, that settles it
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