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D( f )
f^4 = 0
f^4 = 0
f^4 = 0
1*f^4 = 0 // : 1
f^4 = 0
f = 0
f in (-oo:0) U (0:+oo)
200/(f^4) = 0
200*f^-4 = 0 // : 200
f^-4 = 0
f naleu017Cy do O
f belongs to the empty set
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