Unit vector of A- is equal toA- A-A-B- -A-A-A-A- A-A-

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Unit vector o...

Question

Unit vector of $\to A$ is equal to

\frac{| \to A |}{| \to A |}

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\frac{\to A}{| \to A |}

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\frac{| \to A |}{\to A}

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\to A . | \to A |

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The scalars l and m such that $l \to a + m \to b = \to c$ where $\to a, \to b$ and $\to c$ are given vectors, are equal to

\to a

\to b

\frac{{∣ ∣ \to a + \to b ∣ ∣}^{2} - {∣ ∣ \to a - \to b ∣ ∣}^{2}}{{∣ ∣ \to a + \to b ∣ ∣}^{2} + {∣ ∣ \to a - \to b ∣ ∣}^{2}}

| \to a + \to b | = | \to a - \to b |

(\to a, \to b) = \frac{π}{2}

\to a, \to b, \to a + \to b

(\to a, \to b) = \frac{2 π}{3}

\to a

| \to a \times^i |^{2} + | \to a \times^j |^{2} + | \to a \times^k |^{2} =

\to a

\to b

| \to a + \to b | = 1

| \to a - \to b |

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