Solving trigonometric equations

Hey,

I missed a day of math and I have no idea how to do this stuff. Our text book is completely unhelpful and has little more than two examples and the homework.

Basically, the type of problem I need to know how to do is "Solve the equation on the interval xxx" and then it has three sections, each with a different interval. The three intervals are 0 less than or equal to X less than 2pi, -pi less than X less than or equal to pi, and 0 less than or equal to X less than 2pi.

The equations are, for example, SinX=(1/2) for the first interval given, CosX=0 for the second, and Sin[x+(pi/3)=1 for the last.

Please approach it simply, as trig has never been my strong suit. Thank you very much and I appreciate any help!