Question

1+cos A* 1-cos A is equal to​

Answer 1

Answer:

sin²A

Step-by-step explanation:

(1 + cos A)(1 - cos A)

can be simplified using the identity

(a+b)(a-b) = a² - b²

1 - cos² A

which is sin²A

Answer 2

Step-by-step explanation:

(1+cosA)(1-cosA)

(1)²-(cosA)² [a²-b²=(a+b)(a-b)]

1-cos²A

sin²A