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Calculate the angle in radians of (i)...

Calculate the angle in radians of
(i) `1^(@)` (degree)
(ii) `1` (minute of arc or arc minute) and
(iii) `1` (second of arc or arc sec)
in radian.(Use `360^(@)=2pi rad`,`1^(@) = 60^(@)` and `1^(')=60^(@)` and `1^(')=60^(''))`

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