f'(x)= (2'(1-x)-2*(1-x)')/(1-x)²= (0+2)/(1-x)²
f'(-1)= 2/(1+1)²= 2/4= 0,5
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f'(x)= (2'(1-x)-2*(1-x)')/(1-x)²= (0+2)/(1-x)²
f'(-1)= 2/(1+1)²= 2/4= 0,5