Start with Equation IVb.2.5 and obtain Equation IVb.2.6. [Hint: By assuming constant pressure…

Start with Equation IVb.2.5 and obtain Equation IVb.2.6.
[Hint: By assuming constant pressure throughout the flow, the left hand side is
simplified as dP/dx = 0. To simplify the right hand side, first substitute for
the last term from the integration-by-part technique. Now write the Bernoulli
equation and conclude that d(Vx)/dx is also zero.]