$\sqrt{\frac{1}{\left(cosx+1\right)^3}}$
$\frac{x^{12}+1}{x^3+1}$
$\sec^2x\cos^2x+5=6$
$a^2+15a+56$
$\frac{dx}{dt}=tx+t+x+1$
$\left(5x^2+2\right)\left(x+3\right)$
$169x^4-225y^{10}$
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