cos^-1frac{-1}{2}=

foass77W 2021-01-05 Answered
cos112=
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2abehn
Answered 2021-01-06 Author has 88 answers

The value of an inverse trig expression is an angle. cos112 is then asking you what angle on the unit circle has a value of 12 for cosine.
Inverse cosine is restricted to the angles in the first and second quadrant. That is, inverse cosine can only equal an angle oslash such that 0θπ  or  0θ180.
Since cosine is the x-coordinate of the point on the unit circle, you need to look for what point in the first or second quadrant on the unit circle has an x-coordinate of 12. That point is
12,32 in the second quadrant at an angle of oslash=2π3 if your answer must be in radians and cos112=120 if your answer must be in degrees.

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