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CBSE Class 12 Math 2022 (Term II) Delhi Set 2 Solved Paper

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SECTION B
Question numbers 7 to 10 carry 3 marks each.
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Question : 2
Total: 4
(a) Let
→
a
=
^
i
+
^
j
,
→
b
=
^
i
−
^
j
 and
→
c
=
^
i
+
^
j
+
^
k
. If
^
n
 is a unit vector such that
→
a
â‹…
^
n
=0 and
→
b
.
^
n
=0, then find ∣
→
c
â‹…
^
n
|

OR
(b) If
→
a
 and
→
b
 are unit vectors inclined at an angle 30∘ to each other, then find the area of the parallelogram with (
→
a
+3
→
b
) and (3
→
a
+
→
b
) as adjacent sides.
Solution:  
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