$4a\left(a^2+1\right)^2$
$\frac{x^2}{25}-y^4$
$-3x+2<2x+5$
$7x^2+4x$
$\left(27-12\right)-\left(-36+4-30\right)$
$16x^2-72xw^2+81w^4$
$1-2\cos^2a$
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