Show that every point on the curve y=b sin (x/a), where the curve meets the axes of x, is a point of inflextion.
Do i have to plainly show that x=0 is a POI or its asking for something else?

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inflection tends to be a found by a second derivative; and tested for cavage

yeah i know that, but the language isnt very clear up there.

looks like: -b sin(x/a)/a^2 is the second derivative to me

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