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[" Q.7The value of "tan{(cos^(-1)(-(2)/(...

[" Q.7The value of "tan{(cos^(-1)(-(2)/(7))-pi/2)}" is "],[[" (a) "(2)/(3sqrt(5))," (b) "(2)/(3)," (c) "(1)/(sqrt(5))," (d) "(4)/(sqrt(5))]]

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