$9\cos^2x-1=0$
$\int\left(x+1\right)\left(x-3\right)^{-4}dx$
$\left(2x^6\right)\left(x^3\right)$
$\int\left(x+1\right)^{12}dx$
$6x^2+15x-36$
$-4a^2+7a^3-9a^4$
$12x^4+6x^3-9$
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