$cos\left(x\right)-sen\left(x\right)=0$

$25-\left(x+y\right)^2$

$4x^2\cdot2x^2$

$\lim_{x\to\infty}\left(\frac{1}{9x+4}\right)$

$\left(x^5+\frac{3}{5}\right)\left(x^5\frac{1}{10}\right)$

$\left(3x^{3}-13x^{2}+8x-14\right):\left(x-4\right)$

$\left(\frac{1}{5}x-3\right)^2$