I want to derive this equation:
$\displaystyle
y*arctan(x-2) + x*arctan(\frac{y-1}{20}) = 0
$
should i first use the product formulae on the terms on each side of the addition sign? Later should I use the sum formulae on that?
Hello,
I don't want to pick at you ... but I can't see you you around here so I'm going to remove the small typo in your result:
$\displaystyle \frac{y}{1+ (x-2)^2} + \arctan(x-2)y' + \frac{xy'}{20 \left(1+\left(\frac{y-1}{20} \right)^2\right)} + \arctan \left(\frac{y-1}{20} \right) $