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In Exercises 67-76, find each sum.
73.
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Precalculus: A Unit Circle Approach, Books a la Carte Edition plus MyMathLab with Pearson eText -- Access Card Package (2nd Edition)
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Precalculus
Thomas' Calculus: Early Transcendentals (14th Edition)
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Calculus 2012 Student Edition (by Finney/Demana/Waits/Kennedy)
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