$\sqrt{x^2}-25$
$\int x\sqrt{\left(x^2+81\right)}dx$
$36x^2-1=0$
$4x^2+4\sqrt[2]{2}x^2+4y^2-4\sqrt[2]{2}y^2=4$
$\frac{2-\sec\left(x\right)^2}{\sec\left(x\right)^2+2\tan\left(x\right)}$
$13x+25\le298$
$47.8-1.9$
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