$\frac{sec-csc}{\left(sec\right)\left(csc\right)}=sin-cos$
$\lim_{x\to0}\left(8^x-2^x\right)\frac{1}{4x}$
$\int\frac{5x^2}{\left(196+x^2\right)^2}\:dx$
$e^xy\frac{dy}{dx}=e^{-y}\:$
$2x^2+6x-x-3$
$1-\tanh\cdot1+\coth$
$\left(\frac{2}{3}\right)^{-2\cdot2}$
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