$-e^{-x}\left(\cos\left(x\right)+\sin\left(x\right)\right)^2$
$4x^3-12x^2+9x$
$\frac{sin\left(x\right)-tan\left(x\right)}{-2tan\left(x\right)}$
$\frac{dx}{dy}=2x-5y+2$
$3ax+3+3ax+3+3ax$
$\lim_{x\to\infty}\left(x^2+1\right)^2$
$\frac{\left(3-x\right)}{5}>7$
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