1.

prove that ,{cosA+cosB/sinA-sinB}ⁿ + {sinA+sinB/cosA-cosB}ⁿ = {2cotⁿ(A-B/2) , if n is even { 0 , if n odd

Answer» prove that ,

{cosA+cosB/sinA-sinB}ⁿ + {sinA+sinB/cosA-cosB}ⁿ = {2cotⁿ(A-B/2) , if n is even
{ 0 , if n odd


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