$\frac{4a^2-12a+9}{2a-3}$
$\int\frac{sin\left(\sqrt{x}\right)}{4\sqrt{x}}dx$
$-2sin^2x=sinx-1$
$\frac{3}{5x\:+\:x^2}\:.\:\left(x-1\right)$
$\:\frac{2x^3+4x^2-8}{2x}$
$25x^2+90xa+81a^2$
$21x\:+\:35$
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