If 100∑k=0sec(3π7+kπ2)sec(3π7+(k+1)π2)= −A cosec (Bπ7), then – InterviewSolution

1.	If 100∑k=0sec(3π7+kπ2)sec(3π7+(k+1)π2)= −A cosec (Bπ7), then [BA] (where [.] is the greatest integer function and A,B∈N) is
Answer» If $100 \sum k = 0 sec (\frac{3 π}{7} + \frac{k π}{2}) sec (\frac{3 π}{7} + \frac{(k + 1) π}{2}) = - A cosec (\frac{B π}{7})$ , then $[\frac{B}{A}]$ (where $[.]$ is the greatest integer function and $A, B \in N$ ) is

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