$\lim_{x\to1}\left(\frac{1-\cos\left(x\right)}{1-x^2}\right)$
$1.8a+9ae$
$3y^2\:-6+x-6y^2-2-4y^2-6x$
$-1.3-\left(4.9+2.6\right)$
$\int\frac{2\csc^2\left(3x\right)}{\cot\left(3x\right)}dx$
$\left(x^3+4\right)\left(x^3-3\right)$
$\left(x+y\right)\left(x-y\right)\left(x^2+y^2\right)y^4$
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