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The slope of a line is double of the slo...

The slope of a line is double of the slope of another line. If tangent of the angle between them is `1/3` , find the slopes of the lines.

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The correct Answer is:
1 and 2, or `1/2` and 1, or `-1 " and " -2`, or `- 1/2" and " -1`
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