$\int_{-1}^{2}xe^{3x^{2}-8}dx$
$u+1=4x^2-2xu$
$\left(21y^2-6y-15\right)\left(27y^2+8y-10\right)$
$12x-9\left(4x^4+12x^3-9x^2\right)$
$\left(x-2\right)^2+2x\left(x-2\right)=0$
$\int_{-7}^7\sqrt{49-x^2}dx$
$9x^2y-6xy$
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