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 Author Comment/Response Donna 09/14/11 06:32am I want to obtain the value of v by solving the following equation, but I couldn't solve it. Could anyone help me out of this? Many thanks. 4.0737764977384675`*^-6 (0.027212939999999998` + v^2/2) == \!\( \*SubsuperscriptBox[\(\[Integral]\), \(0\), \ \(0.00277\)]\(\(-0.0003537282531494735`\)\ \*SqrtBox[\(1 - 1.8765246762994938`*^6\ \*SuperscriptBox[\((\(-0.00073`\) + \((1 - 170.75854741395668`\ x)\)\ x)\), \(2\)]\)]\ Sin[ ArcCos[1369.8630136986303`\ \((\(-0.00073`\) + \((1 - 170.75854741395668`\ x)\)\ x)\)] + \*FractionBox[\(1\), \(180\)]\ \[Pi]\ \*SuperscriptBox[\((2.187876863322191`\ v\ \((1 - 720.980533525595`\ x + 129953.23243071287`\ \*SuperscriptBox[\(x\), \(2\)])\) + \*SuperscriptBox[\(ArcCos[ 0.006283143965559066` - 0.10493594398340247`\ ArcSinh[ 500\ vc\ \((1 - 720.980533525595`\ x + 129953.23243071287`\ \*SuperscriptBox[\(x\), \(2\)])\)]]\), \(3\)])\), \(1/ 3\)]] \[DifferentialD]x\)\) URL: ,