$\lim_{x\to0}\left(\frac{\cos\left(x\right)}{x-\cos\left(x\right)}\right)$
$1+\sin a\cdot1-\sin a=\frac{1}{\sec2a}$
$6x^2-13x-5$
$\int_2^{\infty}\:\frac{1}{n^2+1}dx$
$\int8x\cdot\cos\left(4x^2\right)dx$
$y'=3xcos\left(2x\right)$
$\left(2ab-c\right)^2$
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