OpenStax, Precalculus 2e §7.2 Sum and Difference Identities · Exercise 28 · Trigonometry · Compound & multiple angles
Sum and Difference Identities · Exercise 28
Simplify the expression, and then graph both expressions as functions to verify the graphs are identical.
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 28
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