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

4-113.

Find all values of where

*(*

*is an element of the interval from*

*).*

is undefined

Rewrite

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).