Question

Sin 150 + sin 120 dibagi cos 120 - cos 300 = ....

Answer 1

Sin 150 + cos120 =
----------------
Cos 210 - Cos 300 0,5√3 + 0,5
½+½
--------
½√3+½

= 1
------------
½(√3 + 1)

= 2/(√3 + 1) * (√3- 1)/(√3 - 1)
= 2(√3 - 1)3 - 1
= √3 - 1