Mathematics · 2023
JEE Main · 12 April 2023, Shift 1 · Q19
In a triangle A B C, if cos A+2 cos B+ cos C=2 and the lengths of the sides opposite to the angles A and C are 3 and 7 respectively, then cos A - cos…
In a triangle $\displaystyle A B C$, if $\displaystyle \cos A+2 \cos B+\cos C=2$ and the lengths of the sides opposite to the angles A and C are $\displaystyle 3$ and $\displaystyle 7$ respectively, then $\displaystyle \cos \mathrm{A}-\cos \mathrm{C}$ is equal to
Official answer
From NTA’s final answer key for this paper.
(2)
$\displaystyle \frac{10}{7}$
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JEE Main 2023 Mathematics question, with the answer from NTA’s final answer key. Where our answers come from.