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What is Pythagorean Identity in Trigonometry about?

This document summarizes the proof of several trigonometric double-angle formulae. It shows that by putting B=A in the compound angle formulae for sin(A+B), tan(A+B), and cos(A+B), the resulting expressions give the double-angle formulae for sin(2A), tan(2A), and cos(2A). It also derives two alternative forms for the cos(2A) identity using the Pythagorean identity and algebraic rearrangements.

Author

Subrahmanyam Sana

Language

EN