$a_n=n^2+3n-2$
$144x^{10}y^8+48x^5y^7+4y^6$
$6b^2-16-20b$
$-53^2+43-2$
$\sqrt{\sin^24x}$
$9x^2-42xy+39y^2$
$3x^2\left(x^2+5x-1\right)-4x\left(2x^3-x+3\right)$
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