Question

(sin75*cos15-sin15*cos75)^2+0,5

Answer 1

$(sin75*cos15-sin15*cos75)^2+0,5=sin^2(75-15)+0,5=$ 

$=sin^260+0,5=(frac{sqrt3}{2})^2+frac{1}{2}=0,75+0,5=1,25$