Hello, clairez90!

Determine the exact value for each trigonometric expression,

. . given: .

We are given: .

Using Pythagorus, we get: .

We are told that is in Quadrant 2, where cosine is negative.

. . Hence: .

We have: .

We are given: .

Using Pythagorus, we get: .

We are told that is in Quadrant 3, where sine is negaitve.

. . Hence: .

We have: .

Hence, we have: .

We will use these values in all of the following problems . . .

We're expected to know: .

We have: .

We should know: .

We should know: .