If the normal to at is

MATHEMATICS · Single correct · AP · Calculus AB · Contextual Applications of Differentiation · Contextual Applications of Differentiation

Problem

If the normal to

y=f(x)

(0,0)

y-x=0

, then

\lim_{x\to0}\frac{x^2}{f(x^2)-20f(9x^2)+2f(99x^2)}

is (1)

\frac1{19}

(2)

-\frac1{19}

(3)

\frac12

(4) Does not exist.