Question 1179609


{{{sin(alpha)cos(beta)=(1/2)(sin(alpha+beta)+sin(alpha-beta))}}}...............{{{alpha=4theta}}}, {{{beta=2theta}}}

{{{sin(4theta)cos(2theta)=(1/2)(sin(4theta+2theta)+sin(4theta-2theta))}}}

{{{sin(4theta)cos(2theta)=(1/2)(sin(6theta)+sin(2theta))}}}