Taking `theta=30^(@)`, verify each of the following `(i) sin 3theta=3sin theta -4sin^(3)
Channel: Doubtnut
Date: 2020-01-03

Taking `theta=30^(@)`, verify each of the following `(i) sin 3theta=3sin theta -4sin^(3) theta` `(ii) cos3 theta=4cos^(3)theta-3cos theta`