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[" For the principal values,evaluate each of the following: "],[[" (i) "cos^(-1)(1)/(2)+2sin^(-1)(1)/(2)," [NCERT,CBSE2012] "],[" (ii) "cos^(-1)((1)/(2))-2sin^(-1)(-(1)/(2))," [-BSE2012] "],[" (iii) "cos^(-1)(-(1)/(2))+2cos^(-1)(-(sqrt(3))/(2)),],[" (iv) "sin^(-1)(-(sqrt(3))/(2))+cos^(-1)((sqrt(3))/(2)),]]

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