tan 10degree tan 20degree tan 60degree tan 70degree tan 80degree = ?

Asked by david wr | 11th Sep, 2012, 07:44: PM

Expert Answer:

tan 10degree tan 20degree tan 60degree tan 70degree tan 80degree 
= tan 10 tan 20 (root 3) tan (90 - 20) tan (90 - 10)
= tan 10 tan 20 (root 3) cot 20 cot 10
= root 3

Answered by  | 11th Sep, 2012, 10:08: PM

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