$3x^2+x+24\ge0$
$\sec\:^2\left(x\right)-\cot\:^2\left(\frac{\pi\:}{2}-x\right)=1$
$2x^2-4x\:-\:1=0$
$-4\cdot36$
$\left(2y^3-x^3\right)dx+3xy^2dy=0$
$-5x^3\left(3x^2+2\right)$
$\left(2.6458-1.4142\right)$
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