⇒x=0 is the local minima. f′′(x)=(486‌ln‌2)(3(x2−2)3⋅(x2−2)(5x2−2+6x2‌ln‌3(x2−2))) f′′(x)=0‌‌x=√2 f′′(√2+)>0 f′′(√2−)<0 ⇒x=√2‌ is point of inflection ‌ f′′(x)>0‌∀x>√2 ⇒f′(x)‌ is increasing for ‌x>√2