$sin\left(-x\right)=-sinx$
$\left(x+8\right)\left(x+15\right)$
$-\left|-1+\left(-4+1\right)\right|+\left(-3+5\right)$
$-7-1+9+2-10$
$-3-5+2-11-7+4$
$\int xcos\left(x^2+2\right)dx$
$9d\:+\:2a\:+\:6a\:-\:3d\:-4d\:$
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