How to create a triangle to evaluate the inverse trig function with x

The video tutorial explains the concept of sine inverse and how to find an angle using a triangle. It demonstrates the application of the Pythagorean theorem to express a side of the triangle in terms of another variable. The tutorial then covers how to calculate the cosine of an angle using the triangle's sides and discusses simplification techniques for expressions. The instructor emphasizes the importance of creating a triangle for solving problems not on the unit circle.

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