Don't understand job is a typo or I just don't know how to solve it?

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Given the function f(x) in the function body x is missing, instead of the x - variable t

I don't understand how to solve it.
With a theme derived to understand began recently

If the job correctly, can make the analysis of this or similar problem?
April 4th 20 at 13:27
2 answers
April 4th 20 at 13:29
Solution
Probably just a mistake when typing. Instead of t must be x (or Vice versa).
Solved in an elementary, analytically find the derivative of the function and substitute the resulting expression in x=4.
Thank you! - easton17 commented on April 4th 20 at 13:32
April 4th 20 at 13:31
The answer is 0, that's all.

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