How do you evaluate $arcsin(1/2)$ without a calculator?

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Answer 1 · 2017-12-09T14:06:14

$arcsin(1/2)=pi/6$

$arcsin(1/2)$ means the angle whose sine ratio is $1/2$

As $sin(pi/6)=1/2$ ,

$arcsin(1/2)=pi/6$

How do you evaluate arcsin(1/2)arcsin(1/2) without a calculator?