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9 thg 10, 2011 · Making substitution for x^2 still leaves a factor x in the denominator since u = x^2 implies du = 2 x dx. The result then would give a square root of u in the integral, which I cannot …
2 thg 4, 2008 · We simply define the exponential integral as Ei (x):=-\int^ {\infty}_ {-x}\frac {e^ {-t}} {t}dt There is no method to go from your integral to the exponential integral. This is what we …
11 thg 12, 2005 · The anti-derivative of e^ {x^2} is not an 'elementary' function. Because e^ {-x^2} is used so much in statistics, the 'error' function, erf (x), is defined as an anti-derivative of e^ { …
28 thg 4, 2004 · Do anyone have an idea how to calculate integral of (cos x)^2 ? Or is it even possible? I tried some substitutions and/or rules of trigonometry, like cosxcosx+sinxsinx=1, but …
4 thg 9, 2008 · Well, so I really want to integrate what's shown in the title: i.e. \\int \\frac{dx}{(x^2+y^2)^\\frac{3}{2}} Now, I know there are quite a few straightforward answers to …
9 thg 11, 2006 · What happened to the exponential after you integrated by parts? And have you tried their suggestion for i and iii? You can move the d/da inside the integral (justifying this is a …
15 thg 8, 2011 · When you integrate cos (x), you don't have to substitute anything, because you know that the derivative of sin (x) is cos (x), so the integral of cos (x) is sin (x). Similarly, since …
14 thg 6, 2004 · This integral can be done the same way that the integral of exp (-x 2) can be done. First, write the integral of x 2 exp (-x 2) from zero to infinity. Then write the integral of y 2 …
5 thg 12, 2003 · Could someone please help me with the integral of 2^x. dx I bet its really simple but i have looked in several books and they just give the answer.
13 thg 12, 2010 · Homework Statement try ∫∫G x^2 dA ;value is the region bounded by the ellipse 9x^2+4y^2=36 Homework Equations The Attempt at a Solution i think i have to change the …
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