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$\lim_{x\to0}\left(\frac{e^x+x-1}{e^x-1}\right)$
$4\sec\left(x\right)=12sec^2x-1$
$\frac{dy}{dx}-\frac{y}{x}=2e^x+6x$
$\int\left(\frac{\sqrt{4-x^2}}{8x^2}\right)dx$
$\frac{\sec\theta+4}{\sec\theta-4}$
$x^2+8x=-14$
$t^2-1-\frac{t}{3}$
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