Improper integrals

1. Aug 13, 2003

dan

Hi there
I'm having trouble solving this integral!!

Evaluate the improper integral
int[1/(sqrt{absolute value(1-4x^2)})]dx where the upper limit=1, lower limit=0

without ignoring the absolute value sign?

2. Aug 13, 2003

HallsofIvy

What exactly do you mean by "without ignoring the absolute value"?
Since this has an absolute value, one CAN'T do while ignoring the absolute value!

The obvious way to integrate this is to separate into two integrals, one from 0 to 1/2 and the other from 1/2 to 1:
integral (x=0 to 1/2) (1/sqrt(1- 4x^2))dx+ integral(x= 1/2 to 1)(1/sqrt(4x^2- 1))dx and then use trigonometric substitutions.

Using the definition of absolute value is certainly NOT ignoring it!

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