$4x^2-6x^2+7x^220x^2+79x^2$
$x-\frac{-1}{x\sqrt{\frac{1}{x^2}-1}}$
$-2-\left(-39\right)+1$
$\int\frac{1}{x\sqrt{3-4x^2}}dx$
$2\sqrt{49}$
$2\left(-3z\:-\:5\right)\:+\:1$
$\int-\sec^2xdx$
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