Question

13., 17., 18., 19., 20., 21., 23.
PLEASE FAST FAST....⚡⚡⚡⚡​

Answer 1

Answer:

(a+b)³-(a-b)

=(a+b)³-(a-b)

take (a+b) common

=(a+b){(a+b)²-1}

(a+b)(a²+b²+2ab-1)[(a+b)²= a²+b²+2ab]

Answer 2

Which branch in chaitanya