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# arccosine

The inverse of the cosine function, usually abbreviated arccos. It is defined on the restricted domain $$[-1,1]$$, such that for any real number $$x \in [-1,1]$$, $$\arccos(x)=a$$ if and only if $$\cos(a)=x$$. The principal arcosine takes its values in the interval $$[0,\pi]$$.

Arccosine may also be abbreviated by acos or cos-1.

Citation Info

• [MLA] “arccosine.” Platonic Realms Interactive Mathematics Encyclopedia. Platonic Realms, 21 Feb 2013. Web. 21 Feb 2013. <http://platonicrealms.com/>
• [APA] arccosine (21 Feb 2013). Retrieved 21 Feb 2013 from the Platonic Realms Interactive Mathematics Encyclopedia: http://platonicrealms.com/encyclopedia/arccosine/