Cast Diagram Trig. This is called the cast diagram. Trigonometry at as a level includes solving trigonometric equations and finding multiple solutions using a cast diagram or graph.
Is also called the quadrant rule or the astc diagram. The cast diagram helps us to remember the signs of the trigonometric functions in each of the quadrants. In the second quadrant only the values for sin are positive.
For example the c in quadrant 4 tells you that cos is positive there.
The sine wave below has been divided into 4 quadrants. Is used to help solve trig equations in a given range. Is also called the quadrant rule or the astc diagram. In the first quadrant the values are all positive.
