$\frac{d^2}{dx^2}\left(2x^4-6x^3+7x^2+5x\right)$
$8+2\cos a=9$
$4x^{2}+9x+16$
$x^2-4x-2y+5=0$
$\int\left(\left(5x^2+8x+3\right)^3\right)\left(20x+16\right)dx$
$\frac{x^2}{144}-\frac{25y^6}{81}$
$\left(x^2-3x+10\right)^2$
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