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Use a Calculator to Find an Approximate Value of Each cos⁡−1(−3/4)\cos ^ { - 1 } ( - 3 / 4 )

Question 46

Essay

Use a calculator to find an approximate value of each expression correct to five decimal places, if it is defined.
(a)
cos⁡−1(−3/4)\cos ^ { - 1 } ( - 3 / 4 )
(b)
sin⁡−1(0.25)\sin ^ { - 1 } ( 0.25 )

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