OpenStax, Precalculus 2e §7.2 Sum and Difference Identities · Exercise 46 · Trigonometry · Compound & multiple angles
Sum and Difference Identities · Exercise 46
Find the exact value algebraically, and then confirm the answer with a calculator to the fourth decimal point.
Its source prints no answer for this problem, so there's nothing to check against.
OpenStax, Precalculus 2e · §7.2 Sum and Difference Identities · Exercise 46
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