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D( k )
k < 0
k < 0
k in <0:+oo)
k^(1/2) = 15 // - 15
k^(1/2)-15 = 0
1*k^(1/2) = 15 // : 1
k^(1/2) = 15
k^(1/2) = 15 // ^ 2
k = 225
k = 225
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