$x^2-8x-4$
$-18\cdot2$
$15k^2-216$
$5x^2\:para\:x=1$
$8x^4-24x^2+18$
$\int x\left(\frac{x^4+2x^2+2}{x^2+1}\right)dx$
$9^2\cdot x^2$
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