Express as product form: 1+2cos20°
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Answer:
1 + 2cos20°
= 2 (1/2 + cos20°)
= 2 (cos60° + cos20°)
= 2 (2 cos40° cos20°) [applying cosC+cosD]
= 4 (cos40°) (cos20°)
Step-by-step explanation:
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