Homework Statement
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Find a function to represent the series and then find f(?) that will represent its sum.
Homework Equations
The Attempt at a Solution
I kind of understand how to come up with a function, but...
Homework Statement
Simplify 1/(cos^4x+sin^4x)
Homework Equations
One can't apply cosine of a difference when the cosine is raised to a power, right?
The Attempt at a Solution
I tried using several trig identities, but it doesn't get any simpler.
Thank you for any help in advance!