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The value of cos^2 10º – cos10º cos50º + cos^2 50º is :

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The value of cos2 10º – cos10º cos50º + cos2 50º is :

(1)  3/2(1 + cos20º)

(2)  3/2

(3)  3/4

(4)  3/4+ cos 20º

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1 Answer

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Correct option   (3) 3/4

Explanation:

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