$cos\left(\frac{24}{25}-\frac{2}{5}\right)$
$\int x^3\sqrt{\left(x^2+9\right)}dx$
$x^2+1=3x^2$
$\sin\left(a\right)+\frac{\cos^2\left(a\right)}{\sin\left(a\right)}$
$100u^3+40u^5$
$x^6-x^5-2x^2+3x-1$
$-\left(x\:+\:10\right)\:-\:2y\:+\:3x\:+\:6y$
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