The planes A1x + B1y + C1z + D1 = 0 and A2x + B2y + C2z + D2 = 0 are perpendicular. How to find the value of A1A2 + B1B2 + C1C2?
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Two plane are perpendicular then
So substitute the values of a's ,b's and c's in above equation and solve .
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