A and B are two acute angles. Prove that if
sin² (A) + sin² (B) = sin( A + B ), then
A + B = 180/2.
waiting for your help
Last edited by RauLiTo (2006-05-08 23:22:46)
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If A+B=90, B=90-A, A=90-B;
LHS=sin²A+sin²B, since sinB=cosA,
We find the equation is true when A+B=90 degrees or
(A+B)/2=180. Shall try to prove later....
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