Differentiate $x \sqrt{1+y}+y \sqrt{1+x}=0$
11707
If $x\sqrt{1+y}+y\sqrt{1+x}=0$ find $y'$
12726
Differentiating both sides of a non-differential equation
108704
Help with proof of $|x+y| \geq |x|-|y|$
27127
Calculating $\iint (x+y) \, dx \, dy$
88374
How to separate variables in DiffEq of $y'=x-y$
146640
Computing $\lim_{(x,y)\to (0,0)}\frac{x+y}{\sqrt{x^2+y^2}}$
153942
Solution of functional equation $f(x+y)=f(x)+f(y)+y\sqrt{f(x)}$
137919
How do I find $\lim_{(x,y) \to (0,0)} \frac{\sqrt{xy + 1} -1}{x + y}$?
97146
differentiate with respect to a function
72081
$\forall x,y>0, x^x+y^y \geq x^y + y^x$
34565
How do I differentiate this integral?
61293
What's the derivative of: $ \sqrt{x+\sqrt{{x}+\sqrt{x+\cdots}}}$?
98921
Does $y(y+1) \leq (x+1)^2$ imply $y(y-1) \leq x^2$?
29589
How can I differentiate numerically?
75932
Differentiability of $g:=f(\sqrt{x^2+y^2})$ for a $C^1$ function with $f'(0)=0$ NBHM $2008$
48935
Showing $\lim_{(x,y) \to (0,0)} xy \log(x^2+y^2) = 0$
822
Given that $X,Y$ are independent $N(0,1)$ , show that $\frac{XY}{\sqrt{X^2+Y^2}},\frac{X^2-Y^2}{2\sqrt{X^2+Y^2}}$ are independent $N(0,\frac{1}{4})$