i just don't get this now...i got the x-coordinate, but maybe im doing something wrong to find the y coordinate :(

and how would i find the extremas of:

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- May 10th 2009, 03:56 PM>_<SHY_GUY>_<more extreme values
i just don't get this now...i got the x-coordinate, but maybe im doing something wrong to find the y coordinate :(

and how would i find the extremas of:

- May 10th 2009, 05:05 PMpickslides