$\frac{2x^4-2x^3+4x^2-5}{+2}$
$3\sin^2\left(x\right)+\cos^2\left(x\right)+\cos\left(x\right)=0$
$\frac{4x^3-3x^2+2x}{x-1}$
$\cos\left(4a\right)=\left(\cos2a^2\right)-\left(\sin2a^2\right)$
$n^2-2n$
$s^2+8s+100$
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