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Question
For the principal value, evaluate of the following:
`cos^-1 1/2+2sin^-1 (1/2)`
Solution
`cos^-1(cosx)=x`
`sin^-1(sinx)=x`
`cos^-1 1/2+2sin^-1 (1/2)`
`=cos^-1(cos pi/3)+2sin^-1(sin pi/6)`
`=pi/3+2(pi/6)`
`=(2pi)/3`
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