$1-\sin x=\frac{\cos2x}{1+\sin x}$
$5.5x^2+44x-160$
$1-x-x^2>0$
$x^2+2x^3-2x^2+2x-3$
$\left(-3\right)^2-\left(-2\right)^2$
$-6mn+8mn-2mn-mn+9mn$
$\lim_{x\to0}\left(\sin\left(x\right)\tan\left(x\right)\right)$
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