$\left(-8\right)\left(7\right)\left(-9\right)\left(-6\right)$
$\int\frac{\sqrt{x}-3}{2\sqrt{x}}dx$
$f\left(x\right)=\left\{a^2x-7a\:si\:x>1\right\}$
$\cos\left(a\right)=\sin\left(\frac{\pi}{2}-a\right)$
$\frac{dy}{dx}=\frac{4x^2-3xy+y^2}{x^2}$
$\left(a+6\right)\left(4a-8\right)$
$y^2+3y+9$
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