$\left(2p-3q\right)^7$
$\left(x^3-3x+2\right)+\left(-2x^2+7x\right)-\left(-x^3-2\right)$
$\lim_{x\to0}\left(\frac{\sin x}{x}\right)\left(x\right)$
$\frac{2x+2}{3x-6}\ge3$
$3\sin\left(x\right)-1=\sin\left(x\right)$
$\sin^4x-\cos^4x=1-2\cos^2$
$\left(\left(2x-3y\right)-4\right)^2$
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