Question

Tentukan nilai trigonometri berikut.
1. sin + cos
2.

Answer 1

Phi/3 = 60
phi/6 = 30
1. sin phi/3 + cos phi/6 - tan phi/6

= 1/2√3 + 1/2 - 1/3√3

= 1/6√3 + 1/2

sin 150 = sin(180 - 30) = sin 30 = 1/2
cos 330 = cos(360 - 30) = cos 30 = 1/2√3
tan 225 = tan(180 + 45) = tan 45 = 1
tan 120 = tan(180 - 60) = -tan 60 = -√3

2.