$6y^2+5y^2-6$
$\lim_{x\to3}\left(3x+7\right)$
$\frac{\cos\left(-a\right)}{\sec\left(-a\right)+\tan\left(-a\right)}=1+\sin\left(a\right)$
$\frac{t^1-1}{t+1}$
$\frac{2\left(1-x\right)}{\sqrt{4+x}}$
$\frac{3}{4}\:x\:\frac{5}{6}$
$\frac{dy}{dx}\left(3y=\frac{x+3}{y-3}\right)$
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