Question: QUESTION 20 . 1 POINT Which expression below can be obtained from 2sin acos a by using a power reducing formula? Select the correct answer

QUESTION 20 . 1 POINT Which expression below can be obtained from 2sin acos a by using a power reducing formula? Select the correct answer below: O - - - cos (40) 1 - cos (20) - cos (40) O 1 -1 cos (4a) O + + cos (20) - - cos (40) 2 - 2cos (4a) FEEDBACK Content attribution
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