$cot^2xsec^2x=cot^2x+1$
$4\left(2x+1\right)=8x+4$
$25p^2-40p^2+16$
$15y^5\:+\:9y^4\:-\:6y^2$
$343k^3+1000y^3$
$8y+9=8y-3$
$\int\frac{3x-4}{\left(x-7\right)\left(x+1\right)^2}dx$
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