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NDA Math Vector Algebra

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Question : 30 of 101
 
Marks: +1, -0
Consider the following equations for two vectors
→
a
 and
→
b
1. (
→
a
+
→
b
)â‹…(
→
a
−
→
b
)=|
→
a
|2−|
→
b
|2
2. (|
→
a
+
→
b
|)â‹…(|
→
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]
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