If ' \( \theta \) ' is the angle between two lines with slopes \( m_{1} \) and \( m_{2} \), then...
If ' \( \theta \) ' is the angle between two lines with slopes \( m_{1} \) and \( m_{2} \), then what is \( \tan \theta \) ?
Also find conditions of \( ( \) i parallelism (ii) coincidence (iii) perpendicularity.
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