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Which of the following is incorrect? `int_(a+ c)^(b+c)f(x)dx=int_a^bf(x+c)dx` `int_(ac)^(b c)f(x)dx=cint_a^bf(c x)dx` `int_(-a)^af(x)dx=1/2int_(-a)^a(f(x)+f(-x)dx` None of these

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