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For the principal values, evaluate the f...

For the principal values, evaluate the following: `sin^(-1)(-(sqrt(3))/2)+cos e c^(-1)(-2/(sqrt(3)))` `sec^(-1)(sqrt(2))+2cos e c^(-1)(-sqrt(2))` `sin^(-1)[cos{2cos e c^(-1)(-2)}]` `cos e c^(-1)(2tan(11pi)/6)`

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