I'd really appreciate it if someone could help me with these problems. I just don't even know where to start. Thanks so much!

1. use the given values to evaluate the remaining trig functions:

cscx = -5

cosx < 0

2. solve for x: [0,2pi] Sin 3x= 1/2

3. rewrite the expression not in fractional form: 1/(csc x + 1)

4. Verify the identity (work on one side only if possible):

sec x - cos x = sin x tan x