Ragnarok
Substitute z with z=z0+δz and do all the necessary expansions and simplifications .then the denominator will become δz .
factorize the numerator and cancel δz . then the limit will show you the final result that must be 4z0^3-2z0
try it
Ragnarok
Substitute z with z=z0+δz and do all the necessary expansions and simplifications .then the denominator will become δz .
factorize the numerator and cancel δz . then the limit will show you the final result that must be 4z0^3-2z0
try it
Hello, Ragnarok!
You started correctly . . .
I like to break it up into three steps.
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Therefore: . .