$\frac{\left(x+7\right)^2-\left(x-7\right)^2}{1}$
$x^2=i$
$10x-9>3x+5$
$-4a\:x\:3ab$
$\frac{30a^{11}b^9}{10a^2b^4}$
$sin2\:x\:+\:cos\:x$
$2^4\cdot5^4$
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