Here, our first function $f(x)$ is $\sec x$ and our second function $g(x)$ is $\tan x$. The derivative of $\sec x$ is $\sec x \tan x$ and the derivative of $\tan x$ is $\sec^2 x$.
So, applying the product rule, we get:
$$\frac{dy}{dx} = \frac{d}{dx}(\sec x \tan
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