53Sum of Sinusoids

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When given a function that is the sum (or difference) of two sinusoids, such as f(x) = 8sin(x) + 4cos(x), how can we rewrite this as a single sinusoid using our Sum/Difference formulas?","styleRuns":[{"startIndex":0,"length":185,"styleRunExtensions":{"styleRunColorMapExtension":{"colorMap":[{"key":"USER_INTERFACE_THEME_DARK","value":4294967295},{"key":"USER_INTERFACE_THEME_LIGHT","value":4279440147}]}},"fontFamilyName":"Roboto"}]},"headerRuns":[{"startIndex":0,"length":185,"headerMapping":"ATTRIBUTED_STRING_HEADER_MAPPING_UNSPECIFIED"}]}},{"itemSectionRenderer":{"contents":[{"messageRenderer":{"text":{"runs":[{"text":"Comments are turned off. 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