To Graph Sine and Cosine Graphs: 1.) Set up one period on x-axis. 2.) Divide this period into 4 equal parts. 3.) For SINE ~ sine starts at zero, ends at zero and half way between you are at zero. Halfway between the first zeros you are at the “A” value. Halfway between the 2nd pair of zeros you are at the opposite of “A”. 4.) For COSINE ~ Cosine starts at “A”, ends at “A”, halfway between you are at opposite of “A”. Halfway between these max and mins are the zeros. 5.) Connect points with a smooth curve.