Question

Let $f$ and $g$ be periodic functions with the periods $T_{1}$ and $T_{2}$ respectively. Then $f+g$ is
(A) periodic with period $T_{1}+T_{2}$
(B) non-periodic
(C) periodic with the period $\mathrm{T}_{1}$
(D) periodic when $\mathrm{T}_{1}=\mathrm{T}_{2}$

Answer 1

Ans : (D) Hint : f + g is a periodic function.

Answer 2

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Answer 3

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