JEE Mains Model Paper 17

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Question : 73 of 90

Marks: +1, -0

→

a

= i + 2j + 3k ,

→

b

= - i + 2j + k ,

→

c

= 3i + j and

→

d

is normal to both

→

a

&

→

b

then (

→

c

,

→

d

) =

cos−1
4
√30
sin−1
4
√30
cos−1
2
√30
sin−1
2
√30

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