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f '(x)=2x
a: tg kąta z osią ox czyli tg kata 45stopni a=1
a=f '(x) zatem 1=2x -> x=1/2
b: b=f(x)-f '(x)*x
b= 1/2^{2} [/tex]-1*1/2
b=-1/4
y=x-1/4