$a^2+21a-28$
$2+\frac{-10}{5}$
$\left(d^3+3d^2-4d-12\right)y=0$
$tan\left(30\right)^2+1=\frac{1}{\cos\left(30\right)^2}$
$0.5>=2p$
$4x+3x+15+2x+17$
$\int\:\frac{\left(x^3-2x^2+5\right)}{e^{-5x}}dx$
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