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[" 13.If "tan theta=(1)/(sqrt(5))" and "theta" lies in the "I^(" st ")" quadrant,"],[" then "cos theta" is "],[[" (A) "(1)/(sqrt(6))," (B) "-(1)/(sqrt(6))],[" (C) "(sqrt(5))/(sqrt(6))," (D) "-(sqrt(5))/(sqrt(6))]]

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