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Arcsin, arccos and arctan

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Arcsin, arccos and arctan diagram
calc
In trigonometry one often needs to evaluate the reverse of sin, cos, and tan functions. This calc provides these functions, allowing you to find for example "what angle has a sin of 0.5".
Input

Gives asin of
Gives acos of
Gives atan of
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notes
It is important to remember that trigonometric functions are periodic, so for eample sin(x)=0 is true for x=0 rad, π rad, 2π rad, etc. Only the smallest positive result is returned here.