1.

Letf(x)={{:(-1+sinK_(1)pix",", "x is rational."), (1+cosK_(2)pix",", x):} If f(x) is a periodic function, then

Answer»

EITHER `K_(1),K_(2) in` RATIONAL or `K_(1),K_(2) in` IRRATIONAL
`K_(1),K_(2) in " rational only "`
`K_(1),K_(2) in " irrational only "`
`K_(1),K_(2) in " irrational such that " K_(1)/K_(2)` is rational

ANSWER :B


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