Tentukan nilai kebenaran setiap pernyataan berikut ini.a.

Tentukan nilai kebenaran setiap pernyataan berikut ini.a. (exists x in R), x^2=xb. (forall x in R), x+1>xc. (exists x in R), x^3-x>=0d. (forall x in R), x^2=xe. (exists x in R), x+4=xf. (forall x in R)(forall y in R), x^2-y^2=(x+y)(x-y)