Let alpha be the angle between the lines...

Let `alpha` be the angle between the lines whose direction cosines satisfy the equation `l+m-n=0`and `l^2+m^2-n^2=0` then value of `(Sinalpha)^4+(Cosalpha)^4` is

A

`3/8`

B

`3/4`

C

`5/8`

D

`1/2`

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