Math Help - partial derivatives

is this correct?

f(x,y)= arctan(y/x) , f(x)= (2,3)

so, fx(x,y) = -y/(x^2+y^2)

fx(2,3) = -3/(4+9)= -3/13

Originally Posted by mathlovet

is this correct?

f(x,y)= arctan(y/x) , f(x)= (2,3)

so, fx(x,y) = -y/(x^2+y^2)

fx(2,3) = -3/(4+9)= -3/13

Yes .

--Chris