# Help with trig substition

• 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