Tìm các số thực a, b để các vô cùng bé sau tương đương khi x→0 f(x)=sin(ax2+x3)+xln(1+x2)g(x)=(a+2 b)x(1−cosx2)

Plz i want answer and i would appreciate it is is a b c or d

What is this inequality notation? t is less then or equal to 2

Aproduction manager test 10 toothbrushes and finds that their mean lifetime is 450 hours. she then design sales package of this type of toothbrush. it states that the customers can expect the toothbrush to last approximately 460 hours. this is an example of what phase of inferential statistics