设f(x,y)有连续偏导数,如f(x,-x^2)=1,f'1=x,求f'2=？

Question

求过程！急急急！明天就要高数半期考了！

Answer 1

f(x,-x^2)=1
f`1-2xf`2=0
f'1=x
x-2xf`2=0
f`2=1/2