What is the arccos of 0?

arccos 0 = ?

The arccosine is the inverse cosine function.

Since

cos 0 = cos 0º = 1

The arccosine of 0 is equal to the inverse cosine function of 0, which is equal to π/2 radians or 90 degrees:

arccos 0 = cos-1 0 = π/2 rad = 90º

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