$2\cos\left(x\right)=\cos\left(2x\right)$
$\left(2x^3-x^2+x-1\right)\left(x^2+2x-3\right)$
$x^2-15x-7$
$25x^6-4y^2$
$\sqrt{3}\csc\left(\frac{\pi}{5}\right)x-2=0$
$t\sqrt{2t^2+16}$
$-7x+3\ge-18$
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