Because you may not be required to memorize the identities in this section, it’s often tempting to pay no attention to them at all! Exercises 1-4 are provided to familiarize you with what these identities do. Fill in each blank using the word sum, difference, product, or quotient.
The formula
can be used to change a_______ of a cosine and a
sine into the_______ of two sine expressions.
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Algebra and Trigonometry (Looseleaf) - With Access (Custom)
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