21. If f(x) = X 4+x-2 -,x #0 be continuous at x = 0, then 4 f(0) is equal to 1 (b) (c) 1 4 ) (d) 1 (a) 2 1
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limx22f(x)−3f(2x)+f(4x)
=x→0lim2x2f′(x)−6f′(2x)+4f′(4x) (Using L-Hospital's rule)
=x→0lim22f′′(x)−12f′′(2x)+16f′′(4x)
=22f′′(0)−12f′′(0)+16f′′(0)=12
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