$7cos^2\left(3x\right)-cos\left(3x\right)=0$
$y^4+2y^2+y=0$
$1-2\cot\left(x\right)^2$
$\frac{dy}{dx}=\left(x+y+6\right)^2$
$\left(m^2-n+1\right)\left(m^2+m+1\right)$
$\left(x^2y-ab\right)\left(x^2+ab\right)$
$x=\sqrt{x^2-10x+25}$
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