$x-\frac{x^3}{4}+\frac{x^5}{9}-\frac{x^7}{16}$
$8a^2-2a-15$
$log\:\left(3x+9\right)\:=\:log\:\left(5x+5\right)$
$64x^2+32xy+4y^2$
$\frac{-2sin^2\left(x\right)}{4}$
$4x^2+2ax+\frac{a^2}{4}$
$\left(3r-10s\right)\left(3r+10s\right)$
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