I have a review packet that will be almost exactly like a test I will have and I'm stuck on some problems and here is one that is like the rest:

If sin0= -4/7 and cos0 > 0, find sec0

I'm mostly confused because of the negative sine since obviously you can't measure a line and get negative inches.

Can someone show me how they can get the answer for this so I will be able to do similar problems to this on the test?