Question

b) 1-cos 2 A factorize

Answer 1

Step-by-step explanation:

1-cos²a=sin²a OK friend

Answer 2

Answer:

(1+cosA)(1-cosA) and CosA = 1 or -1

Step-by-step explanation:

1-cos^2A

Using the identity:-

a^2-b^2 = (a+b)(a-b)

So,

1-cos^2A = (1+cosA)(1-cosA)

Now,

(1+cosA) = 0 and (1-cosA) = 0

cosA = -1 and 1 = cosA

Hence, CosA = 1 or -1

Hope it helps.....