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If f(x+h)=f(x)+hf'(x+theta h), find thet...

If f(x+h)`=f(x)+hf'(x+theta h)`, find `theta`, given `x=-a, `h=2a and f(x)`=root(3)(x)`.

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The correct Answer is:
`(1)/(2)+-(sqrt(3))/(18)`
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