$25y^2-\left(8y-6\right)^2$
$\frac{k+8}{k}=\frac{9k}{k+8}$
$\int\left(\frac{4x^2}{2}\right)dx$
$25-5\cdot8+2\cdot6-33$
$\frac{3x+12+6+2x}{6}\:+\:\frac{6-x}{6}$
$25x^8-49f^{12}$
$2\cos^2x+\sin x=2$
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