$\lim_{x\to0}5x^{\sqrt{x}}$
$\sin^4x-\cos^4x+\cos\left(2x\right)$
$-4x\left(6-14x\right)$
$\int\frac{1}{\left(t^2+9\right)^2}dt$
$5\sin x-2\cos^2x-1=0$
$8x^2+4x=0$
$\left(-38-\left(-35\right)\right)$
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