SATISFYING Inverse Trigonometric Functions Proof | A Level Maths

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[traitor--]

never quit neil you are the undisputed goat

[InexorableVideos]

You have to be careful, because this identity is only true when 0<x≤1. Inverse cosine is defined also for -1≤x<0. In a real A-Level exam, the question wouod include that doman so you wouldnt need to worry about what im saying.

But when -1≤x<0, arccos(x)= π + the arctan function in the question. This is a lot trickier, and requires you to look at the range of arccos and the arctan funtion.

[BeyClips]

Let cosa = x then tana = (1- x²)^1/2/x ( defining the function)