Math, asked by kaviyarajkumar2004, 1 year ago

Verify cos3=4cos^3A - 3cosA ,when A=30°

Answers

Answered by sweety1387

1

cos3=4cos^3A-3cosA

when A=30°

cos3=4cos^3*30°-3cos30°

cos3=4cos^90°-3cos30°

cos3=4*0-3*√3/2

cos3=-3√3/2

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