$-7x^2+4x-13$
$\frac{1}{3^{2n-1}}$
$\int\left(\frac{cos^2x}{cos}\right)dx$
$\int_1^9\left(x\sqrt[3]{1-x}\right)dx$
$x\:-\:6\:=20$
$3x\left(2x-1\right)^2-2\left(x-3\right)\left(x+3\right)$
$\lim_{x\to0}\sqrt{x}\ln\left(x\right)$
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