Prove that median $AD$ is greater than $\frac{AB+AC-BC}{2}$

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Prove that

Median $AD>\frac{AB+AC-BC}{2}$

My attempt i tried using am gm inequality but cant figure out the way...

Any help will be appreciated..

Thank you

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Applying triangle inequality

$AD+CD>AC$, $\triangle ACD$

$AD+BD>AB$, $\triangle ABD$

$2AD+CD+BD>AC+AB$

$2AD+BC>AC+AB$

$2AD>AC+AB-BC$