$4427\cdot24$
$x^2+3x+6$
$\tan\left(40\right)=\sin\left(40\right)\sec\left(40\right)$
$8\cdot10^9\cdot7\cdot10^{11}$
$\left(9-7f\right)\left(81-63f+49f^2\right)$
$\left(xyz^2-2x^2yz\right)$
$\frac{x^2}{2x+-1}=\frac{-x}{3}$
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