$P$ is a point on the hyperbola $\frac{x^2}{a^2}-\frac{y^2}{b^2}=1,N$ is the foot of the perpendicular from $P$ on the transverse axis. The tangent to the hyperbola at $P$ meets the transvers axis at $T\dot{}$ If $O$ is the center of the hyperbola, then find the value of $OTxON\dot{}$

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