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[" (i) "cos^(-1)(1)/(2)+2sin^(-1)(1)/(2)...

[" (i) "cos^(-1)(1)/(2)+2sin^(-1)(1)/(2)],[qquad [" (i) "x(1)," (1) "]],[[" (i) "x(1)," ( "1)]," [NCERT,CBSE "2012]]

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