Math, asked by neel13naik, 10 months ago

If sin b =1/2 show that 3cosb_4cos^2b=0

Answers

Answered by itzshrutiBasrani

1

Step-by-step explanation:

sinB=1/2 if B=30°

cos3B=4cos^3B-3cosB

3cosB-4cos^3B=-cos3B

=-cos3(30°)=cos90°=0

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