Math/calculus

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Prove

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

  • Math/calculus -

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

  • Math helppp -

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

    I'm unable to solve it

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