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Sin 120° = sin( 180°-120°)
=sin 60°
=0.866
Cos 120° = -cos(180°-120°)
= -cos 60°
= -0.5
Tan 120° = - tan(180°-120°)
= - tan 60°
= -1.73
jeffzod answered the question on December 20, 2017 at 13:01
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