If lim_(x → 0) (cos(2x) + a cos(4x) - b)/x⁴ is finite, then (a +… | JEE Main 2025 Mathematics PYQ | Jeeify

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MCQMediumJEE Main 2025 · 2 April, Shift 2Limits

If $\lim_{x \to 0} \frac{\cos(2x) + a \cos(4x) - b}{x^4}$ is finite, then $\left(a + b\right)$ is equal to:

A
$\frac{1}{2}$
B
$0$
C
$\frac{3}{4}$
D
$-1$

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