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The positive integer value of n >3 satis...

The positive integer value of `n >3` satisfying the equation `1/(sin(pi/n))=1/(sin((2pi)/n))+1/(sin((3pi)/n))i s`

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`1/(sin(pi/n)) = 1/(sin((2pi)/n))+1/(sin((3pi)/n))`
`=>1/(sin(pi/n)) - 1/(sin((3pi)/n)) = 1/(sin((2pi)/n))`
`=>(sin((3pi)/n) - sin((pi)/n))/(sin((3pi)/n) sin((pi)/n))= 1/(sin((2pi)/n))`
`=>(2sin(pi/n)cos((2pi)/n))/(sin((3pi)/n) sin((pi)/n)) *sin((2pi)/n) = 1`
`=>(2sin((2pi)/n)cos((2pi)/n))/(sin((3pi)/n)) = 1`
`=>(sin((4pi)/n))/(sin((3pi)/n)) = 1`
`=>sin((4pi)/n)= sin((3pi)/n)`
`=>sin(pi-(4pi)/n)= sin((3pi)/n)`
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