$\frac{1}{9}\int x\cdot\cos\left(9x\right)dx$
$2x^4-8x^2$
$\log_bx+2\log_b\left(x-2\right)$
$12^3-2^3$
$17\:-\:11y\:+\:4y\:$
$6x^2+9x+5x+3+x+2x^2$
$\int\frac{1}{\left(a^2-x^2\right)^3}dx$
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