Question

If sin theta+cos theta =1.2 then sin theta × cos theta=?

Answer 1

Hey mate here is your answer

sin theta - cos theta = 1/2

(sin theta - cos theta)^2= sin^2theta +cos^2theta -2costheta x sintheta

1/4 = 1 -2costheta x sin theta

2 cos theta x sin theta= 1- 1/4 = 3/4

(sin theta +cos theta)^2= sin^2 theta + cos^2theta +2sintheta x cos theta

                                    = 1+ 3/4 = 7/4

Therefore, sin theta + cos theta = root of 7/2 

Hope it helped you