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      Question

      Find the exact value of

      cos120┬░
      A .5 Correct Answer Incorrect Answer
      B .05 Correct Answer Incorrect Answer
      C -.5 Correct Answer Incorrect Answer
      D -.05 Correct Answer Incorrect Answer

      Solution

      cos120┬░ = cos (180┬░-60┬░) from cos(A-B) = cosA. cosB- sinA.sinB so cos180┬░.cos60┬░-sin 180┬░.sin60┬░ =-1.1/2 -0. тИЪ3/2 =-1/2= -.5

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