Line Integral

  • Thread starter Ted123
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  • #1
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Homework Statement



[PLAIN]http://img580.imageshack.us/img580/9506/linegu.jpg [Broken]

The Attempt at a Solution



Parametrising the curve [itex]C_1[/itex] as follows:

[itex]{\bf p}(t) = (1-t)(1,4) + t(3,3) = (1+2t,4-t)[/itex]


[itex]{\bf p}'(t) = (2,-1)[/itex]

So [itex]\int_{C_1} = \bigg\{ \sqrt{\frac{y}{x}} \frac{dx}{dt} + \sqrt{\frac{x}{y}} \frac{dy}{dt} \bigg\} \;dt = \int^1_0 \bigg\{ 2\sqrt{\frac{4-t}{1+2t}} - \sqrt{\frac{1+2t}{4-t}} \bigg\} \;dt[/itex]

How do I do this integration?
 
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Answers and Replies

  • #2
lanedance
Homework Helper
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i would attempt to rationalise the integrands
 

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