Derive arctangent

**wizzler** · August 1st 2007, 10:29 AM

I want to derive this equation:

$<br /> y*arctan(x-2) + x*arctan(\frac{y-1}{20}) = 0<br />$

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?

**Krizalid** · August 1st 2007, 10:33 AM

You have to use implicit differentiation, the product rule and

$(\arctan{u})'=\frac1{1+u^2}\cdot{u'}$

**wizzler** · August 1st 2007, 10:39 AM

Originally Posted by Krizalid

You have to use implicit differentiation, the product rule and

$(\arctan{u})'=\frac1{1+u^2}\cdot{u'}$

yea and what happens to the y and the x before the arctan term?

**tukeywilliams** · August 1st 2007, 10:47 AM

Originally Posted by wizzler

I want to derive this equation:

$<br /> y*arctan(x-2) + x*arctan(\frac{y-1}{20}) = 0<br />$

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?

You use the product rule.

So $\frac{y}{1+ (x-2)^2} + \arctan(x-2)y' + \frac{xy'}{20 \left(1+\left(\frac{y-1}{20} \right)^2 \right)} + \arctan \left(\frac{y-1}{20} \right)$

**earboth** · August 1st 2007, 10:12 PM

Originally Posted by tukeywilliams

You use the product rule.

So $\frac{y}{1+ (x-2)^2} + \arctan(x-2)y' + \frac{xy'}{20 \left(1+\frac{y-1}{20} \right)^2} + \arctan \left(\frac{y-1}{20} \right)$

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:

$\frac{y}{1+ (x-2)^2} + \arctan(x-2)y' + \frac{xy'}{20 \left(1+\left(\frac{y-1}{20} \right)^2\right)} + \arctan \left(\frac{y-1}{20} \right)$

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