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7-65.

2 wave curves, curve labeled 1, passes through the origin, & (90, comma 1) & (270, comma negative 1). Curve labeled 2, pass through (0, comma 1), &  (180, comma negative 1).Daniel sketched the graphs at right for and .

Unfortunately, he forgot 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 ? ?