Hi, I need help, please!!!

1.explain the difference between solving a trig equation and verifying a trig identity.

1. If asked to solve for x when given a coordinate number in the equation: sinx=(coordinate #), what kind of number will x be? angle, coordinate? radius? do we use our calculator or another resource to solve? what notation is needed to express 'all' solutions?
2. Explain the process of verifying an identity. what are you being asked to do? how do you know when

finished? how do you pick the side to work on? where do you get expressions to substitute?

4.Given the main Pythagorean identity:

sin^2x + cos^2x = 1,

divide both sides by either cos^2x OR sin^2x (you choose) and simplify. What happens?

5.What determines whether to use the + or - in the half-angle formula for sine and cosine? Example, what sign would be used for sin((makeupa#)/2)?