$\frac{x+2}{\sqrt{2x}-7}$
$\sin\left(a\right)-\tan\left(a\right)\cos\left(a\right)=0$
$-\left(3^4\right)^4$
$\left(4mn^3-\frac{1}{5}m^2n^2+5m^3n\right).\left(25m^4\right)$
$\int\frac{x^2}{\left(49-x^2\right)^{\frac{3}{2}}}dx$
$8^x=2^{x-4}$
$3x^3y-9x^3y$
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