1.

If →a and →b are non-zero and non-collinear vectors, then [→a →b ^i]^i+[→a →b ^j]^j+[→a →b ^k]^k is equal to

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If a and b are non-zero and non-collinear vectors, then [a b ^i]^i+[a b ^j]^j+[a b ^k]^k is equal to



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