$\frac{25x-13x}{5x+25}$
$cbvc$
$\sin^2a.\cos^2a$
$\lim\:_{x\to\:\frac{1}{2}}\left(1-sin\left(\pi\:\:x\right)\right)^{2x-1}$
$\left|x\right|^6\cdot\left|x\right|^n$
$\int\frac{\left(a^x+b^x\right)^2}{a^xb^x}dx$
$e^{2y}dy=2xdx$
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