$2sin^2\left(t\right)-sin\left(t\right)-1=0$
$\left(x+1\right)^2+y^2=1$
$\left(3x^3+6\right)\left(x^3-8\right)$
$2x^2\:+\:12x\:-\:16\:=0$
$5sin\left(3x+\frac{\pi}{6}\right)+2$
$-2x^4+3^4$
$\left(5x^2-4\right)\left(5x^2+5\right)$
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