Question

sin6tita+cos6tita+3sin2tira cos2thita=1

Answer 1

To prove,
sin^6theta+cos^6theta+3sin²thetacos²theta= 1
Now,
(sin²theta+cos²theta)³=
(1)³= 1
Now,
(a+b)³= a³+b³+3ab

Hope this helps you!