$4x^3+3x^3+2y-7x^2$
$\sin\left(xy+\pi\right);\:x=e^t\:;\:y=\ln\left(t+1\right);\:t=1$
$5x^2-18x+9$
$\frac{tanxcosx}{sex}$
$\left(3y^2+19y+20\right)$
$\left(2c^2+3d^3\right)\left(3d^3-2c^2\right)$
$\frac { 12 n ^ { 2 } - 8 n } { 2 n }$
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