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For the principal values, evaluate each of the following : `sin^(-1)(-1/2)+2cos^(-1)(-(sqrt(3))/2)` (ii) `sin^(-1)(-(sqrt(3))/2)+cos^(-1)((sqrt(3))/2)`

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`sin^(-1)(-1/2)+2cos^(-1)(-(sqrt(3))/2)`
`=-pi/6+((5pi)/3)=(2pi)/3`
ii) `sin^(-1)(-(sqrt(3))/2)+cos^(-1)((sqrt(3))/2)`
`=-pi/3+pi/6=-pi/6`
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