The key for solving this and other similar identities is the red part. Hope that helps!
i tried this many times, but i cant seem to prove them.
I really need help with this, plz if can prove it, plz show your steps b/c I want to learn to do it myself for later questions.
haha thx, nice trick, never saw it before...again thx a lotNo, because , and multiplying anything by 1 leaves it unchanged.
This is the trick that's used in mathematics all the time - multiplying by a cleverly disguised 1 to change how something looks.