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Q.

cos⁡11∘−sin⁡11∘cos⁡11∘+sin⁡11∘ is equal to

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a

cot⁡56∘

b

tan⁡11∘

c

tan⁡56∘

d

cot⁡11∘

answer is A.

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Detailed Solution

cos⁡11∘−sin⁡11∘cos⁡11∘+sin⁡11∘=cos⁡11∘+cos⁡90∘+11∘cos⁡11∘−cos⁡90∘+11∘=2cos⁡56∘cos⁡45∘2sin⁡56∘sin⁡45∘=cot⁡56∘
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