Question

I need your help....​

Answer 1

Answer:

Theory : A difference of two perfect squares,  A2 - B2  can be factored into  (A+B) • (A-B)

Proof :  (A+B) • (A-B) =

        A2 - AB + BA - B2 =

        A2 - AB + AB - B2 =

        A2 - B2

Note :  AB = BA is the commutative property of multiplication.

Note :  - AB + AB equals zero and is therefore eliminated from the expression.

Check :  1  is the square of  1  

Check :  c1   is not a square !!

Ruling : Binomial can not be factored as the difference of two perfect squares]

cos^2x=0

Step-by-step explanation: