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  3. the expression cos(?/2)cos(?/5) + sin(?/2)sin(?/5)

The expression cos(?/2)cos(?/5) + sin(?/2)sin(?/5) can be rewritten as which of the following?A) cos(7?/10)B)...

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Calculus

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The expression cos(?/2)cos(?/5) + sin(?/2)sin(?/5) can be rewritten as which of the following?A) cos(7?/10)B) cos(3?/10)C) sin(7?/10)D) sin(3?/10)

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