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:

Abandonment Option

A financial decision allowing companies to cease a project or investment to avoid further losses.

NPV

Net Present Value; a calculation used to assess the profitability of an investment, considering the present value of its cash flows.

Variances

Differences between planned financial outcomes and actual results, used in budgeting and financial management to analyze performance.

Abandonment Option

A form of real option in capital budgeting, giving a company the ability to abandon or terminate a project during its life if it becomes unprofitable.