Why do we need restrictions on inverse trig functions

The video tutorial explains the concept of inverse functions and why some functions, like y = x^2, are not invertible without restrictions. It discusses the vertical and horizontal line tests to determine invertibility and how adding restrictions can make a function invertible. The tutorial uses the sine function as an example, showing how restricting its domain allows for an inverse to be found. The importance of these restrictions is emphasized to ensure functions are one-to-one and invertible.

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