Finding the exact value of sin(18 degrees)
8:48
YouTubeblackpenredpen
Finding the exact value of sin(18 degrees)
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 👉 https://youtu.be/ONKPlyN1hpo), and the quadratic formula! I love this so much because this covers so much! Enjoy! sin(18 degrees) by using a special right ...
43.8K viewsApr 12, 2018
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