find the value of sin165 sin 165
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it is sin^2 (165)
as, sin^2 x = (1 - cos 2x )/2
1/2 -cos2x /2
cos2x = cos330 =cos (360 -30 ) =cos 30 = √3/2
so answer is 1/2 -√3/4 = (2-√3)/4
as, sin^2 x = (1 - cos 2x )/2
1/2 -cos2x /2
cos2x = cos330 =cos (360 -30 ) =cos 30 = √3/2
so answer is 1/2 -√3/4 = (2-√3)/4
Tushakar:
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Answer is attached to the file
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