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In the below integral, given that $a$, $\sigma$, $\epsilon$ are constants, how do I pull them outside the integration sign? $$E =\int_{0}^{\pi}{\frac{a^2\sigma \sin\theta}{2\epsilon\sqrt{a^2-x^2-2ax\cos\theta}}d\theta}$$

In fact i need to show that $$E = \frac{a^2\sigma}{\epsilon x}$$

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    Is $x$ supposed to be $\theta$?2012-09-10
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    The formula for E is false. Try x=0.2012-09-10

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