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Thank you so much for your help! Now I wonder even more that I was able to sollte that during my school days ;-).
Sorry, I edited the post.
I would like to know what z is.
My math classes are toooo long ago. Any help to sove this? :-)
f(z) = 4z4-3z3+15z2-9
f(y) = 7y4+38y3+7y2-200
f’(y) = 29772
f’(z) = -1+873y
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