$\cot\left(x\right)-\frac{\csc^2\left(x\right)}{\cot\left(x\right)}$
$2y^2+4y+4$
$x^2-4x-5\ge0$
$4a^4+8a^2a^2+9b^4$
$2sin^2x=1-sinx$
$4=\left(-2\right)$
$s^2+5s+16$
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