Can someone explain a pre-calculus/trigonometry problem?

Unidentified

New member
f(x) = 5 tan x
solve for f(x) = 5
for what values of x is f(x) < 5 on the interval (-?/2 , ?/2)

I apologize. The crappy book for the course does not have examples of how to do these problems. There are only problems in the review questions, but it only gives the answer and I can't figure out how they got there.

Thanks.
 
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