Question

please solve this -: ​

Answer 1

Answer:

p(r-t).(r+t),p(t-u).(t+u),p(u-r).(u+r)

p(r2-rt+tr-t2),p(t2-tu+t2-u2),p(u2-r2+ru-r2)

all the bass are same so we can write only one p

p(r2-rt+tr-t2+t2-tu+t2-u2+u2-r2+ru-r2)

cancel which can be cancelled from above equation.