Conclusion there are trigonometric identities for products of an angle and a rational number; There are no products of an. Why aren't there trigonometric identities with multiplication inside the function?
Proof for hyperbolic trigonometric identities [closed] ask question asked 6 years, 11 months ago modified 6 years, 11 months ago Trigonometric identities ask question asked 9 years, 1 month ago modified 9 years, 1 month ago I have created and uploaded a trigonometric identities workbook (in pdf format) to internet archive which contains many trigonometric.
See other answers and this page for some partial cases. Trigonometric identities from differential equation ask question asked 9 years, 11 months ago modified 7 years, 10 months ago