We need to show that if rpi is a reflection in a plane pi, then the composition rpi of rpi=id using only the algebraic description of rpi without using the geometric definition of reflection at all. I'm very lost. Any ideas?
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We need to show that if rpi is a reflection in a plane pi, then the composition rpi of rpi=id using only the algebraic description of rpi without using the geometric definition of reflection at all. I'm very lost. Any ideas?