Trigonometric Identities and Compound Angles
One identity from Pythagoras, a handful of addition formulas, and you can find sin 75 degrees exactly.
What this unit covers
Unit 6: Trigonometry and Complex Numbers
- 1 Circular Measure and Trigonometric RatiosMeasure angles the way the circle itself does, and know sin, cos and tan of 30, 45 and 60 degrees by heart. · 10 min
- 2 Trigonometric Identities and Compound AnglesOne identity from Pythagoras, a handful of addition formulas, and you can find sin 75 degrees exactly. · 10 min
- 3 Trigonometric Graphs, Equations and the Sine and Cosine RulesWaves that repeat every 360 degrees, equations with more than one answer, and triangles without a right angle. · 10 min
- 4 Complex NumbersWhat if negative numbers had square roots? Invent one, call it i, and every quadratic suddenly has two roots. · 16 min