Question

решите уравнение f'(x)=0, если f(x)=(3x^2+1)(3x^2-1)

Answer 1

$f(x)=(3x^{2}+1)(3x^{2}-1)=9x^{4}-1 \ f'(x)=36x^{3} \ f'(x)=36x^{3}=0 \ x=0$