$\left(8c-3a\right)\left(9c-5a\right)$
$2x^2-11x+15$
$\lim_{x\to+\infty}\left(\left(1-\frac{1}{2x}\right)^{3x}\right)$
$y=x^2-4x\:+\:4$
$\left(-7+x^4\right)^2$
$3-7x<2x+21$
$\left(x^2+1\right)y-\left(1-x\right)^2y=xe^{-x}$
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