$\lim _{y \rightarrow 1}\left(\frac{1}{y^2-1}-\frac{2}{y^4-1}\right)=$
- A$\frac{1}{2}$
- B$\frac{1}{3}$
- C$\frac{1}{4}$
- D$0$
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DifficultJEE MAIN 2019
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