$\frac{5}{2}x+x^8$
$3-\left|1+\left(-3-1\right)-\left(-2\right)\right|+\left(4-6\right)$
$5-6+1-8-2+6+4$
$\frac{sin\left(\pi-x\right)}{sin\left(x+\frac{\pi}{2}\right)}$
$10x^2y^3+6x^2y^3$
$4\left(x-5y\right)^2$
$1\:\:a-1$
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