
James B. answered 06/24/16
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secant is the reciprocal of cosine, or 1/cosine. so y = sec(x) = 1/cos(x)
Vertical asymptotes occur where ther is division by 0.
Thus, when cos(x) =0, we would have 1/0.
Division by 0 is undefined, and that appears as a vertical assymptote on the graph.
The statement is true.