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## Homework Statement

Find f(4) if the integral (lower limit = 0 , upper limit = x) f(t) dt = xcos(pi(x))

**2. The attempt at a solution**

Honestly I dont even know where to start. If you are given an integral, how do you get the original equation f(t) to even insert 4 into?

Sorry if the question is unclear, I am unsure how to actually type out integrals and such on this forum, if someone can give me a link explaining how to , i can rewrite the question so it is easier to understand.

Thanks :)