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Use a half-angle formula to simplify: (sin4 theta)/(1+cos4theta).

Mathematics
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\[\sin4\theta/1+\cos4\]
oh ok :) hmm
The bottom half should read: (1+cos 4 theta)

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Other answers:

Ok so this appears to be the `Tangent Half-Angle Identity`. \[\large \tan \frac{x}{2}=\frac{\sin x}{1+\cos x}\]
So we appears to have something that looks like the `right` side of this identity, yes?
appear*
right, yes.
If it helps, maybe make a substitution. Let \(\large x=4\theta\) We know that this will simplify down to \(\large \tan \dfrac{x}{2}\). So from here, \(\large x=4\theta\), solve for x/2! :)
is that confusing? :c
Ok, never mind that post, I got it. Thanks!!
k c:

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