Answer :

rabiaf183
period of sin is 2pi
so the number 4 which is divided by the sin angle should be multiply by 2 pi
and the answer is 8pi
dalendrk
subtitute t = 1/4x

y = sin(1/4x) ⇒ y = sin t

The period of the y = sin t is 2π

t -> 2π ⇒ 1/4x -> 2π ⇒ x -> 8π

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