$\left(xy+y^2\right)dx+\left(xy+x^2\right)dy=0$

$-x^2+14x+57$

$\lim_{h\to0}\left(\frac{\frac{1}{\left(x+h\right)^2}+\frac{1}{x^2}}{h}\right)$

$125x^6-8y^3$

$ln\left(\sqrt{\left(\left(\frac{x\left(1-x\right)}{x^4+1}\right)\right)}\right)$

$1.2+0.27$

$-3\sin\left(x\right)+3\cos\left(x\right)\cdot\tan\left(x\right)=0$