Question

(1-cos0)(1+cos0) pls help​

Answer 1

sin²Ф

Explanation:

I doubt that you actually meant "cos 0" ... that has a value of 1.

If you meant (1-cos Ф)(1+cos Ф), then this product is 1 - cos²Ф.

That, in turn, is equal to sin²Ф