$\sec\left(x\right)\csc\left(x\right)\cos\left(x\right)$
$\left(\frac{2x}{5y}+\frac{y}{25x}\right)^2$
$\left(t^2+1\right)\:\frac{dy}{dt}+4ty=t$
$x^2-20x+12=0$
$x+2y+3z=7$
$\left(2a+5b-3\right)\left(2a+5b+3\right)$
$-3298-3209$
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