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naspek
naspek is offline
#5
Nov23-09, 01:56 AM
P: 181
ok.. for.. S'(y)=0 -----> 2z - 8/y^2=0

......for.. S'(z)=0 -----> 2y - 4/z^2 =

ok.. by letting z=4/y^2, i get y = 0, +8^1/2, -8^1/2

am i got it correct now?