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NDA Math Vector Algebra
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© examsnet.com
Question : 30
Total: 101
Consider the following equations for two vectors
→
a
and
→
b
1.
(
→
a
+
→
b
)
⋅
(
→
a
−
→
b
)
=
|
→
a
|
2
−
|
→
b
|
2
2.
(
|
→
a
+
→
b
|
)
⋅
(
|
→
a
−
→
b
|
)
=
|
→
a
|
2
−
|
→
b
|
2
3
|
→
a
.
→
b
|
2
+
|
→
a
×
→
b
|
2
=
|
→
a
|
2
|
→
b
|
2
Which of the above statements are correct?
[NDA II 2019]
1, 2 and 3
1 and 2 only
1 and 3 only
2 and 3 only
Validate
Solution:
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