$\left(7-x\right)^4$
$3x-2y+5y-4x-3x+y$
$\lim_{x\to0}\left(\frac{6\sin\left(4t^3\right)}{-5t}\right)$
$b^2+7b+12$
$\frac{d}{dx}\frac{\cot^22x}{1+x^2}$
$\lim_{x\to\infty}\left(x\left(e^{x^{-1}}-1\right)\right)$
$\left(-5-5x\right)^2$
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