$1p^{2}+4pq^{2}$
$25x^2-8x+36$
$3\cdot6d$
$21y^2+5y-4$
$12d^3+15n^2-13+9d^3-11n^2-42$
$x^2+4x-252$
$y'=-\frac{2x\left(3y^2+2x^2\right)}{3y\left(y+2x^2\right)}$
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