$\sec y\sin\left(\frac{\pi}{2}-y\right)$
$\left(\frac{2m^{-1}n^5}{3m^0n^4}\right)^2$
$\lim_{x\to1}\left(-2x^3-3\right)$
$\lim_{x\to\infty\:}\:\sqrt{x^2-3}-\:\sqrt{x^2+5}$
$sinx-cos^2x=tan^{\left(2\right)}x-cosx$
$72x^2-12x-24$
$\left(1+\frac{1}{x}\right)\left(1+\frac{1}{x}\right)$
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