### Home > PC > Chapter 4 > Lesson 4.1.3 > Problem 4-39

4-39.

Reminder: first and then take the sine. If

*and*

This is

:

This is the same as (a) above.

This is impossible because

is unknown.

4-39.

Reminder: first and then take the sine. If

This is

:

This is the same as (a) above.

This is impossible because

is unknown.