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The correct formula for exponential interpolation is:

y =ya*(yb/ya)^[(x-xa)/(xb-xa)], xa<x<xb

and also,

x=xa*[ln(yb)-ln(y)]/[ln(yb)-ln(ya)]+xb*[ln(y)-ln(ya)]/[ln(yb)-ln(ya)], ya<y<yb

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Q: What is the equation for exponential interpolation?
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