Question

Sin -(570) + корень из 3 cos 150+tg 315

Answer 1

tg315 = tg (360 - 45) = - tg 45
sin 570 =sin ( 360 + 210) = sin 210 = sin ( 180 + 30) = - sin 30
cos 840 = cos ( 720+ 120) = cos 120 = cos (180 - 60)= - cos 60