MHB How to find the answer sin 120.

Thread starter tmt1
Start date Jun 17, 2015
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Sin

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Sin 120 degrees is equal to sin 60 degrees because both angles are related through the unit circle. Specifically, sin 120 can be derived from the sine of its reference angle, which is 60 degrees. The value of sin 120 is positive, as it is in the second quadrant where sine values are positive. The misconception that sin 120 equals sin 60 plus sin 60 arises from a misunderstanding of how sine functions work in different quadrants. Understanding the unit circle is essential for clarifying these relationships.

Jun 17, 2015

tmt1

I was reading on a forum that $$sin120$$ is equal to$$ sin60$$.

How is this? Shouldn't$$ sin120$$ equal $$sin60 + sin60$$?

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Jun 17, 2015

earboth

tmt said:

I was reading on a forum that $$sin120$$ is equal to$$ sin60$$.

How is this? ...

Good evening,

use the unit circle:
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