Question

亲爱的网友：Y=(A' B)(A B')C (BC)sina=-5/13

Answer 1

g(x)=ax b(a,b∈R)比如kx2 -(k-2 )x k>0比如f(x)=ax2 bx c(a≠0）a(a2-2ab-b2)-b(2a2 ab-b2)