Chapter 4: Trigonometric Functions

1.	Use the Pythagorean Theorem to find the length of one leg of a right triangle, if the hypotenuse is 24 and the other leg is 12. [Hint]
2.	Find the value of the expression by using an identity. [Hint]
3.	Determine the value of the expression. [Hint]
4.	Use a calculator to find an acute angle , if . [Hint]
5.	At a certain time of day, the angle of elevation of the sun is . To the nearest foot, find the height of a tree whose shadow is 40 feet long. [Hint]
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