there's:
$$\int^{2\pi}_{0} \frac{dx}{\mathrm{sin}^4x+ \mathrm{cos}^4x}$$
I was always confused if it is possible to solve this integral not using Tangent half-angle substitution? Because it takes much time for calculus only, is there another way?
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use the weierstrass substution – Dr. Sonnhard Graubner Apr 17 '17 at 14:02
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1Which one is ur question, the title or the content? – lab bhattacharjee Apr 17 '17 at 14:03
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There was typo in the title, fixed now – M.Mass Apr 17 '17 at 14:12