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