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Problem If a ^ \hat{a} a ^ x \mathbf{x} x a ^ \hat{a} a ^ ( a ^ × x ) + b = x (\hat{a} \times \mathbf{x}) + \mathbf{b} = \mathbf{x} ( a ^ × x ) + b = x x \mathbf{x} x 1 2 [ a ^ − b + ( a ^ × b ) ] \frac{1}{2}[\hat{a} - \mathbf{b} + (\hat{a} \times \mathbf{b})] 2 1 [ a ^ − b + ( a ^ × b )] 1 2 [ 2 a ^ − b + ( a ^ × b ) ] \frac{1}{2}[2\hat{a} - \mathbf{b} + (\hat{a} \times \mathbf{b})] 2 1 [ 2 a ^ − b + ( a ^ × b )] [ a ^ + ( a ^ × b ) ] [\hat{a} + (\hat{a} \times \mathbf{b})] [ a ^ + ( a ^ × b )] Browse the problem library