Let f ''(x) be continuous at x=0 If li...

Let `f ''(x)` be continuous at `x=0`
If `lim_(xto0) (2f(x)-3af(2x)+bf(8x))/(sin^(2)x)` exists and `f(0)ne0,f'(0)ne0`, then find the value of `3a//b` is________.

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