$-4-5+1-1$
$\int\frac{1}{4\left(y^2+4\right)}dy$
$\frac{d}{dx}x^2+1$
$9x^2+49=0$
$2+9x+5+6x$
$2x+\-\left[5y+\left(3x-z\right)+2-\left(-x+y-z+4\right)\right]-\left(-x+y\right)\\cdot$
$\left(2a+7b-3c\right)^2$
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