$9+\left(-8\right)+9\left(-8\right)$
$2\sin x\tan x=3$
$3x^2-4x-2x^2-4x$
$40x^2-42x+9$
$\sqrt[3]{a}\cdot\sqrt{a^7}$
$\int\left(x^2+1\right)\left(\frac{1}{3}x^3+x\right)^{13}dx$
$\tan\left(x\right)+\cot\left(x\right)\sin\left(x\right)\cos\left(x\right)=1$
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