$\left(4mn-yn\right)^2$
$16x^4-\frac{16}{81}y^2$
$\sec^20=1+\sin^20\sec^20$
$\left(t^{-5}\right)^{-10}$
$\frac{1}{2}+0.25-0.2$
$2r^2+9r+4=0$
$\left(xy^2+4\right)^3$
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