$2xy+y-6x-3$
$14^{-2}\cdot14^2$
$\cos\left(6\right)+\sin\left(6\right)=\tan\left(6\right)$
$\left(4x^2y^2\right)^{\frac{1}{2}}$
$9a\:-\:7b\:+\:4a\:-\:4\:-\:3b\:+\:4$
$\left(m^2+\:4\right)^3$
$\sin\left(90-x\right)=\frac{1-\sin^2x}{\cos x}$
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