Agniveer Vayu or IAF Group X 19 Jan 2023 Paper

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Question : 30 of 70
 
Marks: +1, -0
If 
→
a
=(
→
i
+2
→
j
−3
→
k
)
 and 
→
b
=(3
→
i
−
→
j
+2
→
k
)
 then the angle between (
→
a
+
→
b
)
 and (
→
a
−
→
b
)
 is?
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