$\left(12a-7b\right)^2$
$\frac{cos^2x}{1-cosx}=\frac{cosx}{secx-1}$
$\ln\left(\frac{3y}{5z}\right)$
$a+c=r-d$
$-7y-3\sqrt{-14y^{2}}+71y+33$
$x\cdot\frac{dy}{dx}+4y=\frac{6}{x^5}$
$2-7x^2-8x^2$
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