Find the Exact Value of Each Expression, If It Is $\cos ^ { - 1 } ( - 1 )$

question 37

Essay

Find the exact value of each expression, if it is defined.
(a) $\cos ^ { - 1 } ( - 1 )$
(b) $\sin ^ { - 1 } ( - 1 )$
(c) $\tan ^ { - 1 } ( - 1 )$

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