$\lim_{x\to\infty}\left(\frac{secx-cosx}{x^2}\right)$
$\sqrt{x^3-2}y'\:=\:x^2$
$\left(\frac{\sin\left(x\right)}{\cos\left(x\right)}\right)^2$
$\left(2x^{a-1}+3^{1-a}\right)^5$
$3\sin^2$
$4\cos x-2=0$
$x^2+2x-224$
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