I have a fraction with long denominator exceeds the page. Can you help me solve my problem? here is the code:
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\begin{equation}
\dfrac{p_{t}}{p_{i}}=
\dfrac{2j\left(\gamma+\displaystyle\frac{z_{m}}{Z}\right)\sin\:kd\cos\:\phi}{\left(\cos\:kd\cos\:\phi+j\left(1+\dfrac{z_{p_{1}}\cos\:\phi}{z_{f}}\right)\sin\:kd\cos\:\phi\right)\left(\gamma e^{jkd}+z_{m}\left[\cos\:kd+j\left(1+\dfrac{Z}{z_{f}}\right)\sin\:kd\right]\right)-\left(\gamma+\displaystyle\frac{z_{m}}{Z}\right)}
\end{equation}