Algorabi, Maha Saeed, and M.A Sharaf. “Fourier Series Expansions of Powers of the Trigonometric Sine and Cosine Functions”. JOURNAL OF ADVANCES IN MATHEMATICS 12, no. 5 (June 30, 2016): 6248–6253. Accessed May 14, 2024. https://rajpub.com/index.php/jam/article/view/246.