$\left(2x^5-3x^2\right)^3$
$26y^2+y-1$
$cos\left(arctan\left(\frac{x}{\sqrt{10}}\right)\right)$
$\left(x+\sqrt{-1}\right)^4+\left(x-\sqrt{-1}\right)^4$
$sin^2x=\frac{1}{5}$
$\frac{x+3}{2}=5$
$14cos^2x+9cosx+1=0$
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