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If veca,vecb,vecc are coplanar vectors t...

If `veca,vecb,vecc` are coplanar vectors then find value of `[veca-vecb+vec2c vecb-vec c+2veca veca+2vecb-vec c]`

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As `veca,vecbvec c` are coplanar then any linear combination of `veca,vecbvec c` are coplanar.
Hence, `[veca-vecb+2vec c vecb-vec c+2veca veca+2vecb-c]=0`.
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