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Prove that (cos 3 x)/(sin 2 xsin 4x)+(...

Prove that
`(cos 3 x)/(sin 2 xsin 4x)+(cos 5x)/(sin 4xsin 6x)+(cos 7x)/(sin 6xsin 8x)+(cos 9x)/(sin 8x sin 10x)`
`=(1)/(2) (co sec x)[co sec2x-co sec 10x]`

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