Invert a function containing integration term

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Consider this simple equation $$ \tau(t)=\int\frac{dt}{a(t)},$$ where $\tau$ and $a$ are functions of $t$. Now, from this equation, how can I calculate $a(\tau)$ ?

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$\tau'(t)=\frac 1 {a(t)}$ so $a(t)=\frac 1 {\tau'(t)}$.