$-2\left(x-1\right)$
$\lim_{x\to0}\:\frac{x-tanx}{x-senx}$
$4\left(2\right)^5\left(4\right)-2\left(2\right)\left(4\right)$
$2w^2-52w=-46$
$21\cdot39$
$3\left(0\right)^2+8\left(0\right)$
$f\left(x\right)=x^1$
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