1.

SinB=1/2 then 3cosB-4cos.cos.cosB

Answer»

SINCE sinB=1/2, B=30°

SUBSTITUTING B

⇒ 3cos30°- 4COS³30°

⇒3 X √3/2 - 4 x (√3/2)³

⇒3√3/2 -3√3/2

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