$25\:x\:0.38$
$tan\left(\frac{1}{2}-\frac{\sqrt{3}}{3}\right)$
$-4-\left(5-7\right)-\left(4+5\right)$
$\frac{2}{1+1^2}+\frac{1}{1^2}$
$\frac{dx}{dy}=2x-5y+2$
$\left(\frac{5a}{4b}\right)^{-2}$
$-3x+2x-6+5-2y+4y$
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