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CBSE Class 12 Math 2022 (Term II) Delhi Set 1 Solved Paper

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Question : 8
Total: 14
(a) If
→
a
 and
→
b
 are two vectors such that |
→
a
+
→
b
|=|
→
b
|, then prove that (
→
a
+2
→
b
) is perpendicular to
→
a
.
OR
(b) If
→
a
 and
→
b
 are unit vectors and θ is the angle between them, then prove that sin‌‌
θ
2
=‌
1
2
|
→
a
−
→
b
|
Solution:     👈: Video Solution
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