I don't understand what f(u)(t-u) means in the following maths problem. Is it somehow a function of a function or a function multiplied by (t-u)? Or something else? The question is:

Please solve the following convolution equation:

∫ f(u)(t-u) cos(2(t-u)) du = ∫ sin(2u) sin(2(t-u)) du

(Both integrals go from 0 to t)

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