$\int\sec^{2}\left(x\right)dx$
$\frac{dy}{dt}=\frac{3}{xe^{t+7x}}$
$3\sin x-1=2\sin x$
$\int_0^1\left(\frac{1}{x^2-2x}\right)dx$
$\left(x+y+z+w\right)^2$
$1+5x>5-3x$
$\int\left(\sqrt{16-x^2}\right)xdx$
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