Question

Evaluate (a) sin 120°(b) tan 135° (C) cos 240°​

Answer 1

Answer:

sin 120 = 2 sin 60 cos 60 = 2 * root(3)/2 * 1/2

tan 135= tan(180^o - 45^o) = (tan180^o - tan 45^o)/(1 + tan180^o* tan 45^o)

tan 135^o = (0-1)/(1+0) = -1

cos 240=-cos 60=-1/2