$x+20\le\frac{2}{5}-2x$
$\left(7a-4\right)\left(2a^2+2a-5\right)$
$-\sec^{4}x+\tan^{4}x=-1-2\tan^{2}x$
$\frac{3x^3+x^2+x-2}{x^2}$
$81v^4-900v^2$
$\sin\left(-x\right)+\cos\left(360+x\right)$
$-8y^7\left(-3y\right)$
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