Home -> Solved problems -> Calculate cos(arccos(pi))

### Solution

The arccosine of $$x$$ is defined as the inverse cosine function of $$x$$ when $$-1≤x≤1$$: $\arccos x=\cos ^{-1} x$
$$\pi \notin[-1,1]$$ thus $$\cos ^{-1} \pi$$ is undefined therefore $$\cos (\cos ^{-1} \pi)$$ is undefined.

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Home -> Solved problems -> Calculate cos(arccos(pi))

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