Example: stock market
Sum and Difference Identities - Pretty Math
Practice with Sum and Difference Identities Write each expression as the sine, cosine, or tangent of a single angle. _____ 1. cos80°cos20°+sin80°sin20° _____ 2. sin30°cos45°+cos30°sin45° _____ 3. cos20°cos45°−sin20°sin45° _____ 4. …
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