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Principal value of sin^(-1)(-(1)/(2))+co...

Principal value of `sin^(-1)(-(1)/(2))+cos^(-1)(-(1)/(2))` is (a)`(pi)/(2)` (b)`-(pi)/(2)` (c)`(3pi)/(2)` (d)none of these

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The correct Answer is:
`pi/2`
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