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how to find sin20 degrees without using calculator. Using identities

 how to find sin20 degrees without using calculator. Using identities
 

Grade:10

1 Answers

Saurabh Koranglekar
askIITians Faculty 10335 Points
5 years ago
Dear student

Sin 3A = 3sin A - 4 ( sin A)^3

A = 20 and 3A = 60

This is how one can find

Regards

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