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B
45
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C
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Solution
The correct option is C cos21∘+cos22∘+cos23∘+....+cos290∘ = (cos21∘+cos289∘)+(cos22∘+cos288∘)+...+(cos244∘+cos246∘)+cos245∘ = (cos21∘+sin21∘)+(cos22∘+sin22∘)+...+(cos244∘+sin244∘)+cos245∘=44+12=892.