$\frac{2\tan\left(x\right)}{1+2\tan\left(x\right)}$
$1+5\cdot_{\left(4\cdot7+5\cdot_{\left(15-4\cdot5\right)}\right)}-3\cdot\left(7-4\right)$
$\frac{21f^{-8}}{7f^2}$
$63+63+63+63$
$\left(5x+3y\right)\left(5x+y\right)$
$-9w+5-8w-4$
$4x^4-12x^3+8x^2y$
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