If l, m, n are the direction cosines of a normal to the plane 2x - 3y + 6z + 4 = 0, then what is the value of 4l² + m² - n²? - NDA Mathematics 2024 (I)

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If l, m, n are the direction cosines of a normal to the plane 2x – 3y + 6z + 4 = 0, then what is the value of 4l² + m² – n²?