Question

(p-q)(p+q)+(q-r)(q+r)+(r-p)(r+p)=0​

Answer 1

Answer:

it is true

Step-by-step explanation:

we know that

(a+b)(a-b)=a^2-b^2

Answer 2

Answer:

1step :-p2-q2+q2-r2+r2-p2 than all cut,at last 0