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प्रश्न
What are the direction cosines of X-axis?
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उत्तर
\[\text { The x - axis makes angles 0°, 90° and 90° with x, y and z axes, respectively } . \]
\[\text{ Therefore, the direction cosines of x - axis are cos 0°, cos 90° , cos 90° , i . e} . 1, 0, 0 .\]
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