Evaluate the following: a) sin^(-1)(sin...

Evaluate the following:
a) `sin^(-1)(sin(pi/4))`
b) `cos^(-1)(cos(2pi/3))`
c) `tan^(-1)(tan(pi/3))`

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The correct Answer is:

(i) ` = (2pi)/3, (ii) = pi//3 , (iii)pi//3 , (iv) pi/3, (v) (5pi)/6, (vi) - pi/3 `.

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