If the resultant of the vectors `3 hati +4 hatj +5 hatk` and `5 hati +3 hatj + 4hatk`

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If the resultant of the vectors `3 hati +4 hatj +5 hatk` and `5 hati +3 hatj + 4hatk` makes an angle `theta` with x-axis, then find `cos theta`.
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