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cos210° - cos10°cos50° + cos250° is equal to (1) 3/2 (2) 3/4 (3) 3/2(cos20° + 1) (4) 3/4(cos20° + 1)

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cos210°  - cos10°cos50° + cos250° is equal to (1) 3/2

(2) 3/4

(3) 3/2(cos20° + 1)

(4) 3/4(cos20° + 1)

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The correct answer is  2) 3/4 

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