$-2009-209$
$-\left(3+5-6\right)-4-\left(-5-6+7-2\right)$
$\sin\left(2f\right)=-\cos\left(f\right)$
$\frac{2dy}{dx}+3\cos\left(2x\right)-7=0$
$x\::\:\left(-8\right)\:-\:4\:=\:20$
$\int\frac{1}{\sqrt{2+9x^2}}dx$
$18x^2-45x-8$
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