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After working through this problem, webwork gives me "The domain of your function doesn't match that of the correct answer". Usually this happens if you have a log function that needs absolute value bars or are missing a +C, but that doesn't apply here so I'm wondering if I'm missing something obvious in the question?

$$\int\frac{\sec^2(8t)\tan^2(8t)}{\sqrt{16-\tan^2(8t)}}dt $$

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I think your problem is that inside the $\tan$ you have $8t/4$ and the $4$ should be on the outside of the parens. (Otherwise you'd write $\tan 2t$, eh?_)

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  • $\begingroup$ Perfect! That's totally correct, thanks! $\endgroup$ – Jrow Jan 17 '19 at 23:47

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