Theta is an intimidating word, but all it really represents is an angle in a given triangle. Sin, cos, and tan are measures of relationships in a triangle with the angle theta.
Let this be the triangle we're working with, with theta marked. The hypotenuse is the longest side, in this case...
I'm in Cegep in Canada, which is basically between high school and University. I strongly liked chemistry in the past, and I was very strong. Last semester, our chemistry class was Chemistry of Solutions (covering equilibrium, kinetics, acids-bases, etc), and this semester we have to take...