If veca=hati+2hatj+4hatk, vecb=hati+lamd...

If `veca=hati+2hatj+4hatk, vecb=hati+lamdahatj+4hatk, vecc=2hati+4hatj+(lamda^2-1)hatk` then find the non zero value of `vecaxxvecc`, given `veca, vecb` and `vecc` are coplanar (A) `2hati-hatj` (B) `-10hati+5hatj` (C) `2hati+hatj` (D) `hati+hatj+hatk`

A

`-10hati + 5hatj`

B

`-10hati - 5hatj`

C

`-14hati - 5hatj`

D

`-14hati + 5hatj`

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A

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