# Why the value of sin120 equal to sin60?

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Nghi N.
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Feb 17, 2017

1. By unit circle.

On the unit circle, the arc

2. By Table of special arcs:

On the Table -->

3. By trig identity:

sin 2a = 2sina.cos a

sin 120 = 2sin 60.cos 60.

Trig table gives

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