cos210*+sin 150*-tg 240*

Question

cos210*+sin 150*-tg 240*

Answer 1

cos210*+sin 150*-tg 240*=cos(180*+30*)+sin(180*-30*)-tg(180*+60*) =-cos30*+sin30*-tg60*=-√3/2+½-√3=(1-3√3)/2