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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) |
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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,n∈N) |
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