$\"\"$

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The projection points are $\"\"$ and $\"\"$

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Find the projection of $\"\"$ onto $\"\"$ : $\"\"$ .

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Substitute $\"\"$ and $\"\"$ in the projection formula.

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$\"\"$

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$\"\"$

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The projection of $\"\"$ onto $\"\"$ $\"\"$ is $\"\"$ .

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$\"\"$

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Find $\"\"$ .

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The vector $\"\"$ is sum of two orthogonal vectors.

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Let the two orthogonal vectors be $\"\"$ and $\"\"$ .

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Therefore $\"\"$ .

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One of the orthogonal vector is of $\"\"$ onto $\"\"$ : $\"\"$ .

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$\"\"$

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Substitute $\"\"$ and $\"\"$ in $\"\"$ .

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$\"\"$

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$\"\"$

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$\"\"$

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The sum of two orthognal vectors is $\"\"$ .

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$\"\"$

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The projection of $\"\"$ onto $\"\"$ $\"\"$ is $\"\"$ .

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The sum of two orthognal vectors is $\"\"$ .