$3ab\:\:5a$
$x^2y+y$
$x^3+5x^2-9x-45$
$3^{x^2+x}=9$
$sin^2\left(x\right)=6sin\left(x\right)+7$
$\frac{\left(1-\tan\:^2\left(x\right)+\tan\:^4\left(x\right)\right)}{\cos\:^2\left(x\right)}$
$\left(\frac{5x}{6}+\frac{2}{7}\right)$
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