Question

Question #3ea95

Answer 1

`LHS=(2a sin y cos y)^2 + a^2(cos^2 y-sin^2 y)^2`
`=(a sin2 y)^2 + a^2(cos2 y)^2`
`=a^2 sin^2 2 y + a^2cos^2 2 y`
`=a^2 (sin^2 2 y + cos^2 2 y)=a^2xx1=a^2=RHS`
verified