[" 3If "a>0" and "b<0" ,then "sqrt(a)sqr...

[" 3If "a>0" and "b<0" ,then "sqrt(a)sqrt(b)" is equal to (where,"i=sqrt(-1)" ) "],[[" (a) "-sqrt(a|b|)," (b) "sqrt(a|b|)" i "],[" (c) "sqrt(a*|b|)," (d) None of these "]]

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