[" 17.If "A(1,2),B(-3,2)" and "C(3,-2)" are the vertices of "Delta ABC," show that: "],[[" (i) "tan A=2," (ii) "tan B=(2)/(3)quad " (iii) "tan C=(4)/(7)],[" 18.If the slope of a line is twice the slope of other line and the tangent of the angle "],[" them is "(1)/(2)," find the slopes of two lines."]]