$9cot^2\left(y\right)\left(sec^2\left(y\right)-1\right)=9$
$\lim_{x\to\infty}\left(\ln2x-\ln\left(x+5\right)\right)$
$ax-2y=1$
$\lim_{x\to0}\left(\frac{x^4-1}{\ln x}\right)$
$4x^2+36x+49$
$ac-ad+bc-bd$
$-2\cdot4+1$
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