cosec^2 teeta multiple (1 sum cos teeta)^2 multiple (1 substrate cos teeta)^2 equals to K.
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» cosec²Ø (1 + cosØ)² (1 - cosØ)²
= cosec²Ø [ (1 + cosØ) (1 - cosØ) ]²
= cosec²Ø . sin⁴Ø
= sin²Ø
Hence, k = sin²Ø
i.e. k € [0, 1]
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