$x-20=-5\left(x-8\right)$
$\frac{1}{1-\sin^2\left(a\right)}-\frac{1}{\csc^2\left(a\right)-1}$
$x^2-5x+8$
$\int ln\left(9x+1\right)dx$
$\int\frac{1}{\left(x^2+5x+6\right)}dx$
$\frac{10^{t^2}\cdot10^{2t}}{10^2}$
$\frac{4\left(x^5\right)^3}{12x^9}$
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