Use an Addition or Subtraction Formula to Write $\cos 12 ^ { \circ } \cos 18 ^ { \circ } - \sin 12 ^ { \circ } \sin 18 ^ { \circ }$

question 33

Essay

Use an addition or subtraction formula to write $\cos 12 ^ { \circ } \cos 18 ^ { \circ } - \sin 12 ^ { \circ } \sin 18 ^ { \circ }$ and find its exact value.

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Definitions:

Market Risk

The risk of losses in investments due to market-wide phenomena, affecting all investments across the board.

CAPM Approach

A financial model used to determine the expected return on an investment, considering its risk relative to the market using the Capital Asset Pricing Model.

Shareholder Wealth

The value that shareholders gain from their investment in a company, measured by stock prices and dividends.

Project Risk

The uncertainty associated with achieving project objectives within defined constraints such as scope, time, and budget.