# The domain of your function doesn't match that of the correct answer

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?_)