What is the value of the integral F(a)?

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Given that: $$\int_a^T f(x) \,dx = F(T)$$ Doesn't this mean $F(a) = 0$, because I found the equation: $$\int_a^b f(x)\,dx = \left.F(x)\right\rvert_a^b = F(b)-F(a) $$ and I wondered what's the point of putting $F(a)$ if it equals to zero.