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व्यंजक cot 9^(@) + cot 27^(@) + cot 63^(...

व्यंजक `cot 9^(@) + cot 27^(@) + cot 63^(@) + cot 81^(@)` का मान है

A

`sqrt(16)`

B

`sqrt(64)`

C

`sqrt(80)`

D

इनमें से कोई नहीं

लिखित उत्तर

Verified by Experts

The correct Answer is:
C
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