Question

show that (n-1-m-1)(m-n)-1=(mn)-1​

Answer 1

Step-by-step explanation:

( n-1-m-1) (m-n) -1 =(mn) -1

n-1+m-1×m-n-1=mn-1

n-n-1-1-m×m=mn-1

-2n-2-m²=mn-1

-2n-m²-2+1=mn

-2n-m²-1=mn