1.f(x)=(2x-a)/(x^2+2)？ Definition (x∈R)

Derive the formula (u/v)' = (u'? v-uv^')/v^2？ Draw:

f'(x)=(-2x^2+2ax+4)/〖(x^2+2)〗^2？

When-1 =

g(x)=-2x^2+2ax+4>； 0

Here is the tip.

2. The topic is unclear, "For any a∈A and T" or "For any m∈A and T"