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Principle Of Mathematical Induction

Question

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In any triangle ABC, prove that: $straight a cubed space cos left parenthesis straight B minus straight C right parenthesis space plus space straight b cubed space cos space left parenthesis straight C minus straight A right parenthesis space plus space straight c cubed space cos space left parenthesis straight A minus straight B right parenthesis space equals space 3 space abc$

Solution

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