$\int\frac{x-1}{81x^4-1}dx$
$-12x-13$
$cot\left(a\right)+sec\left(a\right)\cdot sin\left(a\right)=1$
$4\left(5x^3-13x^2-36x+36\right)$
$\int11xe^{-2x}dx$
$3^4.6^2.6^8.3^2$
$3x=90$
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