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[" 7.If "2tan^(-1)(cos x)=tan^(-1)(2cose...

[" 7.If "2tan^(-1)(cos x)=tan^(-1)(2cosec x)" then "sin x+cos x=],[[" A) "2sqrt(2)," B) "sqrt(2)," C) "(1)/(sqrt(2))," D) "(1)/(2)]]

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