Suppose that f : R → R is a function such that f(x+y) = f(x)+f(y) for all x, y ∈ R. Prove that f has a limit at 0 iff f has a limit at every point c in R.

just pick what you think i need more time let me know if this

step-by-step explanation:

a

step-by-step explanation:

the denominator cannot be the same as one of the factors.

8 denominator times 2 denominator = 16

and 7 numerator time 11 = 77

77/16= 77/16 ( they cannot be further simplified)

since no one answered yet i will give it a shot, not completely sure tho.

i think it should be y=cos(x+2pi), (third answer, answer c)

good luck.