(Sin a+cos a)^2-2sin a*cos a

Question

(Sin a+cos a)^2-2sin a*cos a

Answer 1

(a+)^2=a^2+2ab+b^2
sin^2a+2sinacosa+cos^2a-2sinacosa=1
sin^2a+cos^2a=1
Ответ: 1