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Daniel sketches the graphs at right for and .

Unfortunately, he forgets to label the graphs, and now he cannot remember which graph goes with which equation. Explain to Daniel how he can tell (and remember!) which graph is and which is .

Look at the -intercepts. What is ? ?

2 wave curves, curve labeled A, passes through the origin, the points (90, comma 1) & (270, comma negative 1). Curve labeled B, passes through (0, comma 1), &  (180, comma negative 1).