$2sinx+cscx=0$
$2cosx-3tanx=0$
$5=\tg3t$
$2x\left(x^2-4x+3\right)$
$\frac{x^2+8x+15}{-40-3x+x^2}$
$x^3-4x^2-11x+30$
$2x^3-8x^2z+4x^2z^3$
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