Q 19: Find the value of the following:cos220째 + cos 70째sin-31째 + – InterviewSolution

1.

Q 19: Find the value of the following:cos220째 + cos 70째sin-31째 + sin- 5gosin'64+ cos 64째 sin 26

Answer»

cos^2 20+cos^270 + sin^264+ cos64 .sin26 sin^231+ sin^259

=cos^2(90-70) + cos^270 + sin^264+ cos64. sin(90-64) sin^2(90-59)+sin^259

=sin^270+cos^270 + (sin^264 +cos^264 ) cos259+sin259

= 1/1 +1 = 2

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