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Question

find the equation of the plane passing throgh the intersection of planes 2x+3y-z+1=0; x+y-2z+3=0 and perpendicular to the plane 3x-y-2z-4=0. also find the inclination of this plane with the XYplane.

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Solution

Any plane passing through the intersections of planes, 2x+3y-z+1=0 and x+y-2z+3=0 can be given as, 2x+3y-z+1+λx+y-2z+3=0x2+λ+y3+λ+z-1-2λ+1+3λ=0Now this pane is perpendicular to 3x-y-2z-4=0So 32+λ-3+λ-2-1-2λ=0λ=-56Putting this value we get, x2-56+y3-56+z-1-2×-56+1+3-56=07x+13y+4z-9=0and XY-plan equation is z=0So angle, cosθ=0+0+472+132+42×12=4231θ=cos-14231

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