CPM Homework Help : CCG Problem 5-66

Using the triangle below, write an expression representing $\cos52º$ . Then write an expression for $\tan52º$ and $\cos38º$ . What other ratio is equivalent to $\cos38º$ ?

A right triangle with legs labeled a, and, b. The hypotenuse is labeled, c. The angle opposite, a, is 52 degrees.

Hint:

Recall that $\cos=\frac{\text{adjacent}}{\text{hypotenuse}}$ .

More Help:

Where is the $38º$ angle in the triangle?

Refer to the Math Notes box in Lesson 5.1.2 for the different trigonometric ratios.