July 15th, 2007, 11:01 AM  #1 
Newbie Joined: Jul 2007 Posts: 1 Thanks: 0  Integral ... HELP PLEASE!!!
Can someone please help me with the below problem and show ALL steps to derive the answer ... if you can please include your substitution etc. ... Problem: Find the indefinite integral of: = (2x3) / Sqrt(4xx^2) dx THANKS A LOT FOR YOUR HELP!!!! Miranda 
July 23rd, 2007, 12:11 PM  #2 
Newbie Joined: Jul 2007 Posts: 2 Thanks: 0 
( 2x  3 ) / sqrt ( 4x  x^2 ) = ( 2x  4 + 1 ) / sqrt ( 4x  x^2 ) = [ ( 2x  4 ) / sqrt ( 4x  x^2 ) ] + [ 1 / sqrt ( 4x  x^2 ) ] I = integral [ ( 2x  3 ) / sqrt ( 4x  x^2 ) ] dx = integral [ ( 2x  4 ) / sqrt ( 4x  x^2 ) ] dx + integral [ 1 / sqrt ( 4x  x^2 ) ] dx = I' + I'' I' = integral [ ( 2x  4 ) / sqrt ( 4x  x^2 ) ] dx I'' = integral [ 1 / sqrt ( 4x  x^2 ) ] dx I' = integral [ ( 2x  4 ) / sqrt ( 4x  x^2 ) ] dx =  integral [ ( 4  2x ) / sqrt ( 4x  x^2 ) ] dx =  2 . sqrt ( 4x  x^2 ) I'' = integral [ 1 / sqrt ( 4x  x^2 ) ] dx = integral [ 1 / sqrt ( 4  4 + 4x  x^2 ) ] dx = integral [ 1 / sqrt ( 4  ( x  2 ) ^ 2 ) ] dx 2u = x  2 2du = dx I'' = integral [ 1 / sqrt ( 4  4 u ^ 2 ) ] 2 . du = integral [ 1 / sqrt ( 1  u ^ 2 ) ] du = arcsin ( u ) = arcsin [ ( x  2 ) / 2 ] I = I' + I'' = arcsin [ ( x  2 ) / 2 ]  2 . sqrt ( 4x  x^2 ) + K 

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