$1+\cot^2\left(-u\right)=\csc^2\left(u\right)$
$7y+1\le y-5$
$4a^6-1$
$35x^2+9x-2+2x=0$
$x^3+x^2+2x$
$4\sin^2x+4cosx-5=0$
$\left(-6\right)^3-3\left(-6\right)^2-4\left(-6\right)-30$
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