Efficient Integration Techniques for Complex Functions

  • Thread starter Thread starter nameVoid
  • Start date Start date
  • Tags Tags
    Integration
nameVoid
Messages
238
Reaction score
0
<br /> \int \frac{x^{1/2}}{1+x^{1/3}}<br />
not sure how to start here


 
Physics news on Phys.org
Put x = t^6
 
try a trig substitution like x=atan6θ. Can't really say what a good value for 'a' would be so.
 
I think Count Iblis's suggestion is a good one.

Also, you should get into the habit of including the differential in your integrals, like this:
\int \frac{x^{1/2}}{1+x^{1/3}}dx
If you consistently leave it out, you'll set yourself up for big problems when you integrate using trig substitutions and other techniques.
 
Like Count Iblis, I was going to suggest changing variables.
 
Prove $$\int\limits_0^{\sqrt2/4}\frac{1}{\sqrt{x-x^2}}\arcsin\sqrt{\frac{(x-1)\left(x-1+x\sqrt{9-16x}\right)}{1-2x}} \, \mathrm dx = \frac{\pi^2}{8}.$$ Let $$I = \int\limits_0^{\sqrt 2 / 4}\frac{1}{\sqrt{x-x^2}}\arcsin\sqrt{\frac{(x-1)\left(x-1+x\sqrt{9-16x}\right)}{1-2x}} \, \mathrm dx. \tag{1}$$ The representation integral of ##\arcsin## is $$\arcsin u = \int\limits_{0}^{1} \frac{\mathrm dt}{\sqrt{1-t^2}}, \qquad 0 \leqslant u \leqslant 1.$$ Plugging identity above into ##(1)## with ##u...
Back
Top