Question: What is the open interval (or intervals) where the function is Concave Up? f(x) = 5x - tan(x) x is an element of (-pi/2, pi/2)

What is the open interval (or intervals) where the function is Concave Up?

f(x) = 5x - tan(x)

x is an element of (-pi/2, pi/2)

The answer is (-pi/2, 0) but I want to learn the process involved in solving a problem like this.

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