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Show that the line d/a+y/b=1 touches the...

Show that the line `d/a+y/b=1` touches the curve `y=b e^(-x/a)` at the point where it crosses the y-axis.

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The correct Answer is:
`m_(1)=m_(2)=-b/a`
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VMC MODULES ENGLISH-DIFFERENTIAL CALCULUS 2-JEE Advanced (Archive)
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