Hello, absolutjessy!

We are told that is in Quad 2 or Quad 3.

Sine is negative in Quad 3 and Quad 4.

. . Hence, is in Quad 3.

is in a right triangle with:

. . Then: .

We have: .

n . . . . . . . . . . . . . . .

n . . . . . . . . . . . . . . .

n . . . . . . . . . . . . . . .