There are four quadrants and ASTC techniques helps you remember if a trigonometric function is positive or negative in each quadrant. ADD - All (Sin, Cos, Tan) are positive SUGAR - Sin is positive ...

sin x^\circ = \frac{3}{4}\) Since this is sin and is positive this means that we will be in the two quadrants in which the sine function is positive, ie the first and second quadrants.