$\int\left(2x\sqrt{x^2+9}\right)dx$
$-8x-30=-12x-58$
$a^{21}-125$
$sec^2a-sec^2a\cdot sin^2a$
$\lim_{x\to\frac{6}{5}}\left(\frac{25x^2-36}{5x+6}\right)$
$\frac{x^5+2x^3-x-8}{x^2+5}$
$\left(a+2x\right)\left(2x-3a\right)+4ax+3a^2$
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