$\left(7a+2\right)^2$
$45-24-37+87-23+35$
$1256^{-4}$
$\tan\left(70\right)\frac{300}{y}$
$f\left(x\right)=\frac{4}{9-x^{2'}}$
$\left(5-h\right)^2$
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