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1/(cos alpha + cos 3 alpha)+ 1/(cos alph...

`1/(cos alpha + cos 3 alpha)+ 1/(cos alpha + cos 5 alpha)+ 1/(cos alpha + cos 7 alpha)`
`+....+ 1/(cos alpha +cos(2n+1) alpha)`
`= 1/2 "cosec" alpha[tan (n+1) alpha - tan alpha ]`

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