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Problem 2. Prove the Law of Cosines using only the Pythagorean Theorem and some algebra and trigonometry. You may nd the diagram shown at the
Problem 2. Prove the Law of Cosines using only the Pythagorean Theorem and some algebra and trigonometry. You may nd the diagram shown at the right useful. [Show that C2 = A2 + B2 2ABcosB] Do not use either the algebraic or geometric denition of the clot product in your proof (as this would constitute circular reasoning).
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