Prove that, cos40° cos100° cos160°= $\frac{1}{8}$
Prove that, cos40° cos100° cos160°= $\frac{1}{8}$ Solution: cos40° cos100° cos160° = $\frac{1}{2}$ (2 cos100° cos40°) cos160° = $\frac{1}{2}$ (cos 140° …
Prove that, cos40° cos100° cos160°= $\frac{1}{8}$ Solution: cos40° cos100° cos160° = $\frac{1}{2}$ (2 cos100° cos40°) cos160° = $\frac{1}{2}$ (cos 140° …