Find the partial derivative of (x*y) / (2+x)(4+y) with respect to x...
I know the answer is supposed to be
2y / (4+y)(2+x)^2
I have used Maple's tutor function, but still don't get it... I think I need to know what rules to apply and do I do anything to the equation before I start to differentiate?
Simon DK, thanks.
Thanks! I tried using the formula and more or less found the same answer, but the trouble was the factorization. It amounts to much trouble, if you don't know the truly important rules of factorization.
Thanks Soroban -- and Krizalid thanks to 'u too for 'ur effort. :o)
Okay, so how do I do the factoring, if I wish to take the derivative of the derivative with respect to x?
I know the solution is
-4/((2+x)^3(4+y) or as seen on http://www.econ.ku.dk/polit/studeren..._Mat2004_i.pdf (however, in Danish)... But math is universal, right? :o)
I ended up with (-4x^2 + 16)/((2+x)^4(4+y)) ?