" Life is not a problem to be solved but a reality to be experienced! "
© Copyright 2013 - 2024 KUDO.TIPS - All rights reserved.
=(A+B)(A+B) - (A+B)(A+B)
={(A)(A)+(A)(B)+(A)(B)+(B)(B)} - {(A)(A)+(A)(B)+(A)(B)+(B)(B)}
={A² +2AB + B²} - {A²+2AB+B²}
=A² + 2AB + B² -A² -2AB - B²
=0