$\int\frac{x^2+x-1}{x^3+1}dx$
$2\sin^2x$
$x^2+x-x^2+2x-1$
$-34\cdot41$
$-x^2+21x-98=0$
$\int\frac{72}{x^2+14x+130}dx$
$\sqrt{3a^2}$
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