So I'm a little confused about what to do with a in this equation and am not sure if it should be 0 or 4a^3
I'm trying to find y" of x^4+y^4=a^4 and so far I have 4x^3+4y^3 x y' =?? 4a^3 or zero.
Once I know what the a^4 is supposed to be I can solve it the rest of the way but I have no idea what to do with it.
Thanks