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Let veca=veci-veck,vecb=x veci+vecj+(1-x...

Let `veca=veci-veck,vecb=x veci+vecj+(1-x)veck and vec(c)=yveci+xvecj+(1+x-y)veck`, prove that the scalar triple product `[veca" "vecb" "vec(c)]` is independent of both x and y.

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