$\int\left(\frac{e^{2x}}{1-e^{2x}}\right)dx$
$-\left\{3\left[-4+30-2+6\right]-3\right\}$
$4 ^ { y + 1 } \cdot 4 ^ { 1 - x }$
$9x^4+24x^2+16$
$4n^8-324n^2$
$\int te\cdot\cos\left(x\right)dx$
$\left(a+7\right)^2=a^2+y\:a+49$
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