Math/calculus

Prove

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

asked by Jessica
  1. use your sun-to-product formulas, and this drops right out.

    posted by Steve
  2. Sin 8theta -sin 10theta= cot 9theta (cos 10theta - cos 8 theta)

    I'm unable to solve it

    posted by Jes

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