$\lim_{x\to0}\left(\frac{\left(\sqrt{1+5x}-\:\sqrt{1-7x}\right)}{x}\right)$
$\int3x\left(4x+1\right)dx$
$c2-6c-27$
$\frac{sin^2t}{tan\:t}=sin\:t\:cos\:t$
$\left(6-2x-x^2\right)^2$
$2x^2-36x+648$
$2-\sec\left(x\right)^2$
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