Mathematics · 2025
JEE Main · 2 April 2025, Shift 2 · Q17
If lim_x → 0 (cos (2 x)+ a cos (4 x)- b)/x^4 is finite, then ( a + b ) is equal to:
If $\displaystyle \lim _{x \rightarrow 0} \frac{\cos (2 x)+\mathrm{a} \cos (4 x)-\mathrm{b}}{x^4}$ is finite, then $\displaystyle (\mathrm{a}+\mathrm{b})$ is equal to :
Official answer
From NTA’s final answer key for this paper.
(1)
$\displaystyle \frac{1}{2}$
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JEE Main 2025 Mathematics question, with the answer from NTA’s final answer key. Where our answers come from.