Question

sin theta+costheta=a find the sintheta.costheta​

Answer 1

Answer:

(sintheta + costheta)^2

=sin^2theta + cos^2theta + 2sintheta.costheta

=1+ 2sintheta.costheta = a^2

2sinthrta.costheta= a^2 - 1

sintheta.costheta = (a^2 - 1)/2ans