[" The line "(x)/(a)+(y)/(b)=1" touches ...

[" The line "(x)/(a)+(y)/(b)=1" touches the curve "y=be^(-x/a)" at the point "],[[" (a) "(a,b/a)," (b) "(-a,b/a)," (c) "(a,a/b)," (d) none of these "]]

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