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Q.

cot⁡16∘cot⁡44∘+cot⁡44∘cot⁡76∘−cot⁡76∘cot⁡16∘=

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a

1

b

2

c

3

d

4

answer is C.

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Detailed Solution

cos⁡16∘cos⁡44∘sin⁡16∘sin⁡44∘−1+cos⁡44∘cos⁡76∘sin⁡44∘sin⁡76∘−1−cos⁡76∘cos⁡16∘sin⁡76∘sin⁡16∘−1+3=cos⁡60∘sin⁡16∘sin⁡44∘+cos⁡120∘sin⁡44∘sin⁡76∘−cos⁡60∘sin⁡76∘sin⁡16∘+3=12sin⁡76∘−sin⁡16∘sin⁡16∘sin⁡44∘sin⁡76∘−12sin⁡76∘sin⁡16∘+3=122sin⁡30∘cos⁡46∘sin⁡16∘sin⁡44∘sin⁡76∘−12sin⁡76∘sin⁡16∘+3=122sin⁡30∘sin⁡44∘sin⁡16∘sin⁡44∘sin⁡76∘−12sin⁡76∘sin⁡16∘+3=3
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