This is a free lesson from our course in Geometry

 The inverse trigonometric functions (sin-1, cos-1, and tan-1) allow you to find the measure of an angle in a right triangle. All that you need to know are any two sides as well as how to use SOHCAHTOA.(Continued below the video - scroll down)  (More text below video...)
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(Continued from above) Compare sine with inverse sine (General Difference):
Sine is the ratio of two sides of a right triangle (opposite and hypotenuse). Inverse or sin-1 is an operation that uses the same two sides of a right triangle as sine does (opposite over hypotenuse) in order to find the measure of the angle i.e. sin-1 is the measure of angle.
Thus the key difference is: although both sine and inverse sine involve the opposite side and hypotenuse of a right triangle, the result of these two operations are different. One operation (sine) finds the ratio of these two sides; the other operation, sine inverse, actually calculates the measure of the angle (using the opposite side and the hypotenuse.
It will be true in the similar way for cos and cos-1. But remember cos is the ratio of two sides of a right triangle (adjacent and hypotenuse).
The video above will explain more in detail about Inverse Cosine and Sine, and how to apply the concepts in solving real-world problems. This is explained with the help of several examples and done watching video. This helps you to deal with solving problems and help doing the Geometry home work.
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