$\"\"$

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The vector is $\"\"$ .

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If the vector is $\"\"$ , then the magnitude is $\"\"$ .

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$\"\"$

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$\"\"$

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$\"\"$ .

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$\"\"$

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Direction angles: $\"\"$ , $\"\"$ and $\"\"$ .

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Consider $\"\"$ .

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$\"\"$

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$\"\"$

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$\"\"$ .

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Consider $\"\"$ .

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$\"\"$

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$\"\"$

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$\"\"$ .

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Consider $\"\"$ .

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$\"\"$

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$\"\"$

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$\"\"$ .

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$\"\"$

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Vector in terms of cosine angles: $\"\"$ .

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Substitute $\"\"$ , $\"\"$ , $\"\"$ and $\"\"$ . $\"\"$ .

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$\"\"$

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$\"\"$ , $\"\"$ , $\"\"$ .

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$\"\"$ .