### Home > PC > Chapter 4 > Lesson 4.1.2 > Problem 4-30

4-30.

Write with one common denominator.

Substitute *y*^{2} with 1 − *x*^{2} from the given equation.

Simplify.

Rewrite the expression with a common denominator.

Substitute from the given equation.

Rewrite the expression in the numerator with a common denominator.

Simplify and substitute.

1. Multiply out.

2. Make all fractions with the same common denominator.

3. Simplify.