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## Homework Statement

Consider two planes with normal vectors n1=<0,-1,-2> and n2=<-2,1,-2> For these planes and angle theta between them

## Homework Equations

n1.n2=||n1|| ||n2|| cos(theta)

## The Attempt at a Solution

I have gotten my answer for theta to be .729727 radians. Not sure why this isn't right.