$f^2-10f-39$
$m^2+50m+336$
$x+4=28$
$\lim_{x\to\infty}\sqrt{x^2+1}\left(-x\right)$
$\frac{dy}{dx}\cos\left(x\right)-y\sin\left(x\right)=4$
$6x^2+5x-21$
$\sec^2\left(1.570\right)$
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