Question

if a,b, c, are the position vectors of the non-collinear points A,B,C respectively in space , show  that vector  bxc+cxa+axb is perpendicular of plane ABC . 

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Solve  

Tan^-1(-1)

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Prove that area(∆poq) + area(∆sor)= area (∆pos)+area(∆qor)=1/2 area (parallelogram pqrs)