$\frac{d}{dt}\sqrt{1+t^2}cos^4t$
$-10-\left(-13\right)$
$\frac{k}{3}=-13$
$51+390$
$100-16x^2$
$\frac{4}{x-1}+\frac{3}{x+1}$
$\frac{d}{dx}\sqrt{y}+5$
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