$\int\:\frac{7x^8-3x^6-5x^4}{x^2}dx$
$10\cdot3x^3$
$2cos\:6x\:cos\:2x\:+2sin\:6x\:sin2x=1$
$x^2+10x+9=x-1$
$-\left(12+4-9\right)$
$a-1+a-1+a-1+a-1$
$12x-12$
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