Asked by Jessica

Prove

Sin 8theta -sin 10theta= cot 9theta (cos 10theta - cos 8 theta)

7 years ago

Answered by Steve

use your sun-to-product formulas, and this drops right out.

7 years ago

Answered by Jes

Sin 8theta -sin 10theta= cot 9theta (cos 10theta - cos 8 theta)

I'm unable to solve it

7 years ago

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