1.

If the value of √1+cosα+√1+cos2α+√1+cos3α+⋯+to n terms is ksinnα4sinα4cos{(n+1)α4}, then the value of k4 is (where 0<nα<π/2,n∈N)

Answer» If the value of 1+cosα+1+cos2α+1+cos3α++to n terms is ksinnα4sinα4cos{(n+1)α4}, then the value of k4 is
(where 0<nα<π/2,nN)


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