Math, asked by smpsnndrp7kwh9, 1 year ago

if sinB=1/2, show that 3cosB-4cos^3B=0

Answers

Answered by srinathgadipelp77ry7

20

sinB=1/2 if B=30°
cos3B=4cos^3B-3cosB
3cosB-4cos^3B=-cos3B
=-cos3(30°)=cos90°=0

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