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∫ f(x) = 6 ---> f(4) - f(1) = 6
1
.
4
∫ f(5-x) = y.. --> y = f(5-4) - f(5-1) =
1
.
y = f(1) - f(4) = - { f(4) - f(1)} = - (6) = - 6