Mathematics Education Super hard trigonometric identity proof question By Magic Monk on Monday, November 5, 2018 Feel like a brain teaser? Try this trigonometric identity proof. Expect to struggle a bit! Thanks to one of my students who figured this out before me! education mathematics steemiteducation steempress steemstem Previous Post Next Post Related Posts Mathematics Education Vector applications question – Elastic collision, momentum, and kinetic energy Mathematics Education Vectors lesson 21 – Basic vector operations in Geogebra Mathematics Education Vectors lesson 20 – drawing vectors in Geogebra