$\lim_{t\to0}\left(\frac{sin^2t}{cost-1}\right)$
$\cos^2\left(x\right)-\cos\left(x\right)=\sin^2\left(x\right)$
$121-100x^2$
$49x^6-14x^3y^8+y^{16}$
$\frac{\left(5x+7\right)}{3}-4>5$
$-3x+7x-9$
$x^2-4x-5=\left(x-n\right)^2-m$
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