$\left(1-\cos2x\right)\cot x=\sin x\cos x$
$8x^{4}y+7x^{4}y^{2}-6x^{4}y-2x^{4}y^{2}$
$s^2-10s+25$
$4\left(3\right)^2-9$
$\lim_{b\to-\infty}\left(\sqrt{4x^2+2x}+2x\right)$
$3^3-6$
$f\left(x\right)=e^{2x-5}+4x$
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