JEE MATHEMATICS MCQ: LIMITS

1 Easy

1 of 1

Analyzing +4 | -1

\lim \limits_{{x \rightarrow 0}} \frac{\cos 4 x+a \cos 2 x+b}{x^4}

is finite, then

(a, b)=

View answer and explanation

Correct option: C

(-4,3)

Option C ((-4,3)) is correct because the limit is finite only when

a = -4

and

b = 3

, which are found by applying L'Hospital's rule and setting up equations.

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