$-9-5+6-3-2-4+1-15-6-5$
$\frac{1-sin\left(t\right)}{cos\left(t\right)}-\frac{cos\left(t\right)}{1-sin\left(t\right)}=2sec\left(t\right)$
$\left(2a+5d^3\right)^2$
$3x-9x+1$
$\frac{x+y}{x-y}\:+\frac{x-y}{x+y}$
$-2\left(1+4m\right)-8$
$216^5$
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