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2Sin120Cos75
= -Tan75'
Tan 75' = Tan(45'+30')
= Tan 45' + Tan30'
1 - Tan45'Tan30'
= 3/3 + √3/3
3/3 - √3/3
= (3 + √3)(3 + √3)
(3 - √3)(3 + √3)
= 9 + 6√3 + 3
9 - 3
= 12 + 6√3
6
= 2 + √3
Jadi, - Tan 75' = - 2 - √3