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

question 45

Essay

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

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Definitions:

Cognitive-behavioral Therapy

A psychotherapeutic approach that addresses dysfunctional emotions, behaviors, and cognitions through a goal-oriented, systematic process.

Managed Care

A healthcare delivery system aimed at managing cost, quality, and utilization of services, often through prearranged networks of providers and predetermined coverage policies.

Privacy

The right of individuals to keep their personal information confidential and control the disclosure and use of such data.

Treatment Adaptations

Modifications made to conventional therapy techniques or interventions to meet the unique needs of specific populations or individual clients.