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Questions

cotA cot B+cotB cotC+cotC cot A=1 হলে, A, B এবং C এর মধ্যে সর্ম্পক কি?
A+B+C=π
A+B+C=π2
A+B+C=2π//www.w3.org/1998/Math/MathML">A+B+C=2π
A+B+C=π4
ANS : 1
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