$\lim_{x\to7}\left(\frac{24}{b+1}\right)-\left(b-4\right)^2$
$\lim_{x\to-\infty}\left(x^9\:e^{-x^8}\right)$
$\int_0^{\pi45}x\:tan^2\:\left(15x\right)dx$
$6x^2-7x-20$
$4d-3d+2d$
$3^{x+2}+3^x=90$
$4^{-2}x^{-1}y^2$
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