Question

Cos²42°+sin²42°cin²30°​

Answer 1

Ответ:

Наверно, так но ето не точно..

Answer 2

To simplify the expression cos²(42°) + sin²(42°) * sin²(30°), you can use trigonometric identities.

1. First, recall the Pythagorean identity for sine and cosine: cos²(x) + sin²(x) = 1.

So, cos²(42°) + sin²(42°) = 1, because 42° is the same for both sine and cosine.

2. Now, you have:

1 + sin²(30°)

3. To simplify further, you can use the value of sin(30°), which is 1/2:

1 + (1/2)²

4. Calculate (1/2)²:

1 + 1/4

5. Add 1 and 1/4:

5/4

So, the simplified expression is 5/4.