Question

The unit vector along (i+j)
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Answer 1

Answer:

Unit vector along(i+j)is∣i+j∣(i+j) 

∣i+j∣ is magnitude of(i+j) 

we know, 

i and j are perpendicular to each other 

So, ∣i+j∣=i2+j2+2ijcos90o

1+1=2

hence, unit vector along (i+j)is√2(i+j)

Answer 2

Answer:

i+j+k are the unit vector

they are perpendicular to each other

x+y+z