$y=\left(x^2-3x+8\right)^{-2}$
$\cos\left(\pi-2x\right)$
$\frac{1-x}{x}\le2$
$7a-9a+6a+4b$
$3xy'\:-\:y\:=\:lnx\:+1,\:y\left(1\right)\:=\:-2$
$\left(6x^5-2x^3+1\right)\left(2x^6-6x^4-5\right)$
$\int7x^7dx$
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