Ответ:
f'(x) = 3-15х²
3*(1-5х²)=0
-5х²=-1
х²=1/5
х=±1/√5
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Ответ:
f'(x) = 3-15х²
3*(1-5х²)=0
-5х²=-1
х²=1/5
х=±1/√5