$2\cos^2\left(11b\right)-1$
$-9a\:-\:-17a\:=16$
$2n^2-12n-782=0$
$\int e^x\left(4e^x-1\right)^5dx$
$\frac{15a^{2}-a-28}{3a+4}1c$
$\left(x+4y\right)\left(5x-20y\right)$
$4x^2-4x=32x$
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