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

question 46

Essay

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

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Definitions:

Overthink

The act of thinking about something too much or for too long, often leading to excessive worry or analysis.

Internal

Relating to or situated on the inside; often refers to processes or qualities within an entity or organism.

Stable

The quality of being unchanging or not prone to fluctuation, often used to describe emotional or psychological states.

Depression

A common mental health disorder marked by prolonged feelings of sadness and apathy, often impairing daily functioning.