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inverse trig functions are used to obtain an angle measure from any of the angle’s trigonometric ratios. Written, for example, as sin^{-1}(½) = θ or arctan ^{2}⁄_{3} = θ.

Example: What is arcsin(½)? (The ACT will give you a table of values or a diagram to solve this, or you can use your calculator) Answer: 30°.

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