Mathematics · 2021
JEE Main · 25 February 2021, Shift 1 · Q73
Let α be the angle between the lines whose direction cosines satisfy the equations l+m-n=0 and l^2+m^2-n^2=0. Then the value of sin^4 α+ cos^4 α is:
Let $\displaystyle \alpha$ be the angle between the lines whose direction cosines satisfy the equations $\displaystyle l+m-n=0$ and $\displaystyle l^2+m^2-n^2=0$. Then the value of $\displaystyle \sin ^4 \alpha+\cos ^4 \alpha$ is :
Official answer
(1)
$\displaystyle \frac{5}{8}$
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JEE Main 2021 Mathematics question, with the answer from NTA’s final answer key. Where our answers come from.