prove that :-
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3
sinc63 cos(90-63)+cos63 cos(90-63)
=1
=1
Answered by
3
sin63 .cos27 + cos63.sin27
sin(90-27).cos27 + cos(90-27).sin27
cos27.cos27+sin27.sin27
cos^2 27 + sin^2 27{cos^2a+sin^2a=1}
1
sin(90-27).cos27 + cos(90-27).sin27
cos27.cos27+sin27.sin27
cos^2 27 + sin^2 27{cos^2a+sin^2a=1}
1
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