1. the angle A is standard position is defined in terms of the co-ordinates (x,y) of the terminal arm, and the radius r of the circle. the trigonometric functions of the angle A can be expressed in terms of x,y, and r. the expression r/x represents is?

2. how many solutions are there to the equation sin^2 x + sin x = 0 over the domain.

3. smallest positive angle that is equivalent to an angle of -2pi/3 is?