$\left(5x+7\right)\left(5x-7y\right)$
$\tan\left(b\right)=-\frac{5}{12},\:qiv$
$\frac{x-9}{\left(x+5\right)\:\left(x-2\right)}$
$x^2+xy=5$
$\left(5+7a\right)^5$
$1-cosx=2+cosx$
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