Posted by Yoona on Sunday, February 12, 2012 at 11:19am.
f'=4( )^3 * 2
f"=12 ( )^2 * 2
f'''=24 ( )*2
f""=24*4
So I dont know what your question is, but fourth derivative is not zero.
I think you lost the 2's along the way
f'=4( )^3 * 2
f"=24 ( )^2 * 2
f"'=96 ( )*2
f""=192*2 = 384 (= 24*2^4)
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