the only approach for system of ineq is 2 try pt.s

identity means LHS---RHS for all possibe unknowns

(cosx)^2=1
how many roots?

smiliar 3D should also prop with all their size

when operating reflexing,
bear in mind the side length

from x^0.5 to x
it seems take sp or log are the only ways

(a-b)x^2 + (b-c)x + (a-b)
deta=0