$-1\:restar\:-9$
$4.3\:-\:-3.-4$
$3\sin^2z=4\cos^2z$
$\int\frac{3\cos\left(5x-1\right)}{4}dx$
$\lim_{x\to0}\left(x^2+\frac{1}{x^2}\right)$
$\lim_{x\to-100}\left(\frac{10-\sqrt{x}}{100-x}\right)$
$\left(2x-6\right)\left(2x-8\right)$
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