SOLUTION: when finding the exact value of tan165 and you have split the number into 120+45, would you use the 30 degree or 60 degree for 120. like,sin 60 equals {{{Root3/2}}} or sin30 equals

Question 261494: when finding the exact value of tan165 and you have split the number into 120+45, would you use the 30 degree or 60 degree for 120. like,sin 60 equals or sin30 equals
Answer by jsmallt9(3758) (Show Source): You can put this solution on YOUR website!
For any angle not between 0 and 90, you use what's called a reference angle. The reference angle is always the angle between the terminal side of the angle and the x-axis.

So in your case, using the angle between the terminal side of 120 and the x-axis, the reference angle is 60. Here's an illustration:

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