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[" If the curve "y=a^(x)" and "y=b^(x)" intersect at angle "alpha],[" then "tan alpha" is equal to "],[[" (a) "(a-b)/(1+ab)," (b) "(log a-log b)/(1+log a log b)],[" (c) "(a+b)/(1-ab)," (d) "(log a+log b)/(1-log a log b)]]

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