The value of cos210° – cos10°cos50° + cos250° is - DASH

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Question

The value of cos²10° – cos10°cos50° + cos²50° is

${3 \over 2} + \cos {20^o}$

${3 \over 4}$

${3 \over 2}(1 + \cos {20^o})$

${3 \over 2}$

Solution

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