In Exercises 1 and 2, use a graphing utility to graph the function. Use the graph to

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In Exercises 1 and 2, use a graphing utility to graph the function. Use the graph to determine the behavior of the function as x → c.
a. x → (π / 2) +
b. x → (π / 2) -
c. x → (- π / 2) +
d. x → (- π / 2) -
1. f (x) = tan x
2. f (x) = sec x
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