Question

cos theta is equal to 3 by 5 find cos square minus sin theta square by 2 × sin theta × cos theta

Answer 1

I think it's -35 by 96??? I'm sorry I tried so hard and I got this answer. I hope it's correct. I'm sorry if it's wrong

Answer 2

sin theta=4/5
cos^2 theta=(3/5)^2
                  =9/25
sin^2 theta =(4/5)^2
                  =16/25
cos^2 theta-sin^2 theta=9/25-16/25
                                     =-7/25
2*sin theta *cos theta=24/25
therefore the answer is -7/24 
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