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Find the angle between the lines l(1) ...

Find the angle between the lines
`l_(1) : y= (2 - sqrt(3) ) ( x +5)` and
`l_(2) : y=(2+ sqrt(3) ) ( x-7)`.
Thinking Process : If the angle between the lines having the slope `m_1 and m_2` is `theta` then `tan theta = | ( m_1 - m_2)/( 1+ m_1 m_2) |`. Use this formula to solve the above problem.

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The correct Answer is:
the angle between the lines are 60° or 120°.
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