UPSC NDA II 2018 Mathematics Solved Paper

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Question : 68 of 120

Marks: +1, -0

What is (

→

a

−

→

b

)×(

→

a

+

→

b

) equal to ?

[NDA II 2018]

→
0
→
a
×
→
b
2(
→
a
×
→
b
)
|
→
a
|2−|
→
b
|2

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