Question

Question #ed9da

Answer 1

Please see below.

Explanation:

.

Here is the plot of `(cos4x)/(cos2y)+(sin4x)/(sin2y)-1=0`

![enter image source here]
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`y` is indeterminate as you see below:

Here is some of the computation:

![enter image source here]
(https://d2gne97vdumgn3.cloudfront.net/api/file/OaTcrDuEQJqIy1MB9PJg)

Here is a 3-D plot of `sin4x+sin4y`

Here is the contour plot of it:

Here are the roots for `y`:

And here is the 3-D plot of `2sin2xsin2y`

And here is the contour plot of it:

There does not seem to be a solution or a way of proving the equations presented. If you come across one please forward it to me.