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Posted by **Yoona** on Sunday, February 12, 2012 at 11:19am.

- calculus -
**bobpursley**, Sunday, February 12, 2012 at 11:27amf'=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.

- calculus -
**Steve**, Sunday, February 12, 2012 at 5:03pmI 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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