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lim(y to 0) ((x+y)sec(x+y)-xsecx)/(y)...

`lim_(y to 0) ((x+y)sec(x+y)-xsecx)/(y)`

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To solve the limit \[ \lim_{y \to 0} \frac{(x+y) \sec(x+y) - x \sec x}{y}, \] we can follow these steps: ...
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