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In the equations of Law of Cosines do I multiply the two by both a AND b or just A?

In the equations of Law of Cosines do I multiply the two by both a AND b or just A-example-1
User Pod Mays
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The final answer is 34.0

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In the equations of Law of Cosines do I multiply the two by both a AND b or just A-example-1
User JFM
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