What is the fundamental period of f(x) =...

What is the fundamental period of `f(x) = (sin x + sin 3x)/(cos x + cos 3x)` a)`pi//2` b)`pi` c)`2pi` d)`3pi`

A

`pi//2`

B

`pi`

C

`2pi`

D

`3pi`

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The correct Answer is:

B

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