Question

A) (1+cosa)(1-cosa).​

Answer 1

Объяснение:

sin² a

............. ........

Answer 2

To simplify the expression (1 + cos a)(1 - cos a), you can use the difference of squares formula, which states that (a + b)(a - b) = a^2 - b^2. In this case, you can think of cos a as a variable and apply the formula:

(1 + cos a)(1 - cos a) = 1^2 - (cos a)^2

Now, simplify the expression further:

1 - (cos a)^2

This expression is equivalent to the square of the sine function:

sin^2 a

So, (1 + cos a)(1 - cos a) simplifies to sin^2 a.