Need trig help.

[jordan83]

2. cos(-3pi/8) + csc(7pi/8)
I have no idea how to start or do this. Help would be appreciated. It's due in the morning!! I need to find the Exact value.

 

[stapel]

I have no idea how to...do this.

What are you supposed to do with this expression? (The instructions weren't included.)

Thank you.

Eliz.