Question

270 sina/2, cosa/2, tga/2-?

Answer 1

А=270 градусов  А/2=135 =90+45
sin 135= sin(90+45)=sin 45 = √2/2

cos 135 = cos(90+45)= -  cos 45 = -√2/2

tg 135 = sin135 / cos135 = -1