Question

if sin B=1/2, then find 3 cos B-4 cos cube B=0​

Answer 1

Step-by-step explanation:

sin B =1/2

SIN B = SIN 30

B = 30

3 COS B -4 COS B

3 COS 30 -4 COS 30

3 √3/2-4(√3/2)^3

3√3/2-3√3/2

0/2

0

HENCE PROVED ...