### Home > PC > Chapter 4 > Lesson 4.2.4 > Problem 4-113

4-113.

Rewrite csc*θ* in terms of sin*θ*.

Flip the fraction on both sides.

Rationalize the denominator.

Simplify.

The sine function is positive in Quadrants I and II.

Use the same thinking process as in (a).

Use the same thinking process as in (a).