How do you evaluate $arcsin(1/sqrt(2))$ ?

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Answer 1 · 2016-04-11T20:14:34

$arcsin(1/sqrt(2)) = pi/4 (=45^@)$

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Assuming $arcsin(x)$ is restricted to $[0,pi)$
the above diagram shows the only configuration for $arcsin(1/sqrt(2))$

How do you evaluate arcsin(1/sqrt(2))arcsin(1/sqrt(2))?