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vec a, vec ba n d vec c are non-collinea...

`vec a, vec ba n d vec c` are non-collinear if ` vec axx( vec bxx vec c)+( vec a. vec b) vec b=(4-2x-sin y) vec b+(x^2-1) vec c` and `( vec c . vec c) vec a= vec c` Then a. `x=1` b. `x=-1` c. `y=(4n+1)pi//2, n in I` d. `y=(2n+1)pi//2, n in I`

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