$\lim_{x\to+\infty}\left(\frac{-x^2+5x}{x+3}\right)$

$\frac{5x^4-3x^3+2x^2-7x-3}{x-1}$

$\left(x^2+2\sqrt{x}\right)\left(x^2-\frac{\sqrt{x}}{2}\right)$

$y^'=lnx-9x^2$

$\:-16\:-\:\:-25\:-\:\left[-34\:+\:\left(-26\:-\:-45\right)\:-\:\left(-12\:-23\right)\:\right]\:-15\:$

$6\left(-2+9\right)$

$6sin^2w+sinw-1=0$