Question

-9/(Sin²18° + Cos²18°)

Answer 1

Ответ:

решение смотри на фотографии

Answer 2

Let's simplify the expression step by step:

1. We know that for any angle θ, Sin²θ + Cos²θ = 1 (this is the trigonometric identity for the unit circle).

2. So, in your expression, Sin²18° + Cos²18° equals 1:

-9/(1)

3. Now, we simply have:

-9/1

4. The expression simplifies to:

-9

So, -9 is the simplified value of the expression -9/(Sin²18° + Cos²18°).