Question: Use the sum and difference formula to find the exact value of the expression. No work, no credit. Do not use calculators. No credit

Use the sum and difference formula to find the exact value of

Use the sum and difference formula to find the exact value of the expression. No work, no credit. Do not use calculators. No credit if using calculator to get the answer. a) Show the formula you use. b) Then use the formula in a) to find your exact answer. sin

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