$2\sec^2\left(y\right)\tan\left(y\right)$
$\left[\left(x+y\right)\left(x-y\right)\right]^2$
$\left(2gr^4\right)^4$
$\lim_{x\to0}\left(\frac{x}{\cos x}\right)$
$5x^2+\frac{2}{5}x$
$16x^2-12a$
$\frac{x^8-1}{\left(x+1\right)\left(x^2+1\right)\left(x^4+1\right)}$
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