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[" 49.If "y=cos^(-1)((9-x^(2))/(9+x^(2))...

[" 49.If "y=cos^(-1)((9-x^(2))/(9+x^(2)))" then "y'(-1)" is equal to "],[[" 1) "-(3)/(5)," 2) "(3)/(5)," 3) "(2)/(7)," 4) "(3)/(8)]]

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