How do you find the value for $tan[tan^-1(7.4)]$ ?

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Answer 1 · 2015-06-01T22:44:53

By definition $tan(tan^-1(7.4)) = 7.4$

More explicitly:

Let $alpha = tan^-1(7.4)$

Then by definition $alpha$ is the unique angle such that $tan alpha = 7.4$ and $-pi/2 < alpha < pi/2$ .

How do you find the value for tan[tan^-1(7.4)]tan[tan^-1(7.4)]?