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Finding the exact value of sin(18 degrees)
Автор: blackpenredpen
Загружено: 2018-04-12
Просмотров: 43432
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This is one classic way to find the exact value of sin(18 degrees), i.e sin(pi/10). We will use the double angle identity for sin(2x), the triple angle identity for cos(3x) (proof here 👉 • cos(3x) in terms of cos(x) ), and the quadratic formula! I love this so much because this covers so much! Enjoy!
sin(18 degrees) by using a special right triangle: • this special triangle gives us sin(18º)
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