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106.23 Proof without words: sin 3x = 3 sin x − 4 sin3 x

Published online by Cambridge University Press:  22 June 2022

K. B. Subramaniam and
Aji Thomas
K. B. Subramaniam
Affiliation:
135, Ganit Ashram, Fine Avenue Phase I, Nayapura Kolar Road, Bhopal, 462042, INDIA e-mail: kbsubramaniam.1950@gmail.com
Aji Thomas
Affiliation:
Regional Institute of Education (NCERT), Bhopal 462002, INDIA e-mail: aji.thomas20@gmail.com

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The Mathematical Gazette , Volume 106 , Issue 566 , July 2022, pp. 330
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© The Authors, 2022 Published by Cambridge University Press on behalf of The Mathematical Association