$39\cdot42$
$\left(7x^2\right)\left(4x^3-6x\right)$
$\left(4\cdot7\right)^{-2}$
$14-1$
$\int\left(12x-8\right)\left(3x^2-4x-1\right)^4dx$
$sin^2x-cos^2x=0$
$3z+6z$
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