$3tan\theta\:-4=tan\theta\:$
$\lim_{x\to1}\left(\sqrt{x}-1\right)$
$-4x+5y;\:x=2\:;\:y=4$
$cos^2x=cosx+2$
$7\left(1-9k\right)-\:5\left(4k+7\right)$
$\lim_{x\to-2}\left(\frac{8x^3-1}{2x-1}\right)$
$100x^2+25x$
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