# Help with trig substition

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• September 1st 2010, 03:00 PM
Mike9182
Help with trig substition
How is the following integrated?

$\int \sqrt{1-4x^2} \,dx$
• September 1st 2010, 03:21 PM
pickslides
try $x = \frac{1}{2}\sin t$
• September 1st 2010, 03:28 PM
Mike9182
I tried that, but I can't find any errors in my work, and I got a different answer than my book did.
• September 1st 2010, 03:35 PM
pickslides
Show me your workings.
• September 1st 2010, 03:53 PM
Mike9182
I found my error going back over it to type it in. Thanks