[ P_1^2 - P_2^2 = \frac\dotm^2 R TA^2 \left[ f \fracLD + 2 \ln\left(\fracP_1P_2\right) \right] ]
[ P_1^2 - P_2^2 = \frac\dotm^2 R TA^2 \left[ f \fracLD + 2 \ln\left(\fracP_1P_2\right) \right] ]
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