$169-26x^2$
$4x^2+1x+49$
$\lim_{x\to5}\frac{x^2-4x-5}{x-5}$
$-\left(a+1\right)^5$
$\frac{4}{5\left(1-x\right)^2}$
$\frac{dy}{dx}=\frac{xy^3}{\sqrt[2]{1+x^2}}$
$\frac{dy}{dx}=y\left(y\cdot e^{4x}\right)^{\frac{1}{2}}$
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