ఒకవేళ \(\frac{sin\, \theta-cos\, \theta}{sin\, \theta+cos\, \theta}=\frac{4}{5}\), అయితే \(\frac{cosec^2\theta}{2-cosec^2\theta}\) యొక్క విలువ ఎంత?

1
\(\frac{16}{25}\)
2
\(\frac{40}{41}\)
3
\(\frac{41}{40}\)
4
\(\frac{31}{30}\)

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