If theta is equal to 30 then find the value of cos 3 theta is equal to 4 cos cube theta minus 3 cos theta
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solution: theta=30
cos 3 theata=4cos^3theta - 3cos theta
cos 90°=4cos^3 30°-3cos 30°
. answer :- 0
cos 3 theata=4cos^3theta - 3cos theta
cos 90°=4cos^3 30°-3cos 30°
. answer :- 0
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