Re: Integration - another Integer as a result

*To*: mathgroup at smc.vnet.net*Subject*: [mg93824] Re: Integration - another Integer as a result*From*: matt <eep1mp at surrey.ac.uk>*Date*: Wed, 26 Nov 2008 05:17:15 -0500 (EST)

Hi Mike, Mathematica built in functions begin with a capital letter. So the function for the sine of an angle is Sin[], not sin[]. I think you used a lower case 's' when you input the equation, which mathematica would treat as a new undefined function and so would now know the integral for the new function, sin[]. So Integrate[2 x Sin[(n Pi x)/L] Sin[(m Pi x)/L)], x] should do what you want :) Cheers, Matt