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Use a Calculator to Find an Approximate Value of Each cos⁡−1(−0.25)\cos ^ { - 1 } ( - 0.25 )

Question 45

Essay

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

Correct Answer:

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