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OpenStudy (anonymous):
Hi.If we know that x+y+z=0 then I want to proof 1/x +1/y+1/z=0 can you proof it for me? x=cos(a) +isin(a) y=cos(b)+isin(b) z=cos(c)+isin(c)
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myininaya (myininaya):
What have you tried?
OpenStudy (anonymous):
xy+xz+yz/xyz
OpenStudy (anonymous):
(x+y+z)^2=x^2 + y^2 + z^2 +2(xy+yz+zx)
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