WBJEE 2020 Math Solved Paper

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Question : 9 of 75

Marks: +1, -0

Let f be a differentiable function with

lim

x→∞

f(x)=0. If y′+yf′(x)−f(x)f′(x)=0,

lim

x→∞

y(x)=0, then (where y′=

dy

dx

)

y+1=ef(x)+f(x)
y−1=ef(x)+f(x)
y+1=e−f(x)+f(x)
y−1=e−f(x)+f(x)

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