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The value of \(\cos 1° \cos 2° \cos 3° ... \cos 180°\) is:

  • A.-1
  • B.0
  • C.1
  • D.1/2

Answer: B

The product runs through every whole degree from 1 to 180, and one of those factors is

\[ \cos 90^{\circ} = 0 \]

A single zero factor makes the whole product 0, whatever the other 179 terms are.

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