$\left(7ab-6cd\right)^2$
$\tan\left(c\right)+\cot\left(c\right)$
$5a^2b^2c^2-15a^2c^2x^2+40a^2c^2y^2$
$4x^2-9x+2$
$\int\left(x+2\right)\sqrt{x+1}dx$
$x+1+y=-40$
$4-3\cdot2$
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