TS EAMCET · Maths · Vector Algebra
If \(|\vec{a}|=1,|\vec{b}|=2,|\vec{a}-\vec{b}|^2+|\vec{a}+2 \vec{b}|^2=20\) then \((\vec{a}, \vec{b})=\)
- A \(\frac {\pi}{3}\)
- B \(\frac {\pi}{4}\)
- C \(\frac {\pi}{6}\)
- D \(\frac {2\pi}{3}\)
Answer & Solution
Correct Answer
(D) \(\frac {2\pi}{3}\)
Step-by-step Solution
Detailed explanation
\(|\vec{a}-\vec{b}|^2+|\vec{a}+2 \vec{b}|^2=20\)…
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