Showing that (-1, 0 0) is the maximum of f(x, y, z)
87369
Finding critical points (extrema) directly without using eigenvalues
58813
Computing $\max_{1/2 \leq x \leq 2} ( \min_{1/3 \leq y \leq 1} f(x,y) )$ where $f(x,y) = x(y \log y - y) - y \log x$.
30860
Prove that $f(x)=0$ in $[-1,1]$.
114844
Global maxima/minima of $f(x,y,z) = x+y+z$ in $A$
23142
Suppose $x, y, z$ are positive real number such that $x + 2y + 3z = 1$. Find the maximum value of $xyz^2$
53536
Maximum value of $f(x) = \cos x \left( \sin x + \sqrt {\sin^2x +\sin^2a}\right)$
39451
Proving inequation with maximum and 2nd derivative
154223
Find the maximum value of $ f(x) = \int^{x}_{0} \sqrt{(x^2-x)^2+y^4}~dy$
18734
Showing that a function is differentiable
116382
Showing convexity of a function with the restriction over an arbitrary line
48935
Showing $\lim_{(x,y) \to (0,0)} xy \log(x^2+y^2) = 0$
99930
Find the Maximum value of $\frac{x}{\sqrt{x+y}}+\frac{y}{\sqrt{y+z}}+\frac{z}{\sqrt{z+x}}$
108704
Help with proof of $|x+y| \geq |x|-|y|$
28399
Showing $f$ is constant
12402
Showing a function on $[0,1]$ is the zero function
966
Show that $\lim_{n\rightarrow \infty} \sqrt[n]{c_1^n+c_2^n+\ldots+c_m^n} = \max\{c_1,c_2,\ldots,c_m\}$
122300
Maximizing a quadratic function subject to $\| x \|_2 \le 1$