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Show that if the axes are rectangular, t...

Show that if the axes are rectangular, the equation of the line through the point `(x_1, y_1, z_1)` at right angle to the lines `x / l_1 = y / m_1 = z / n_1; x / l_2 = y / m_2 = z / n_2` is `(x-x_1) / (m_1n_2 - m_2n_1) = (y-y_1) / (n_1l_2 - n_2l_1) = (z-z_1)/ (l_1m_2 - l_2m_1) `

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Show that if the axes are rectangular the equation of line through point (x_1,y_1,z_1) at right angle to the lines x/l_1=y/m_1=z/n_1,x/l_2=y/m_2=z/n_2 is (x-x_1)/(m_1n_2-m_2n_1)=(y-y_1)/(n_1l_2-n_2l_1)=(z-z_1)/(l_1m_2-l_2m_1)

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