Question

Cos альфа × cos альфа

Answer 1

Ответ:

решение смотри на фотографии

Answer 2

The expression "cos α × cos α" can be simplified using the trigonometric identity known as the double-angle formula for cosine. The formula states that:

cos(2α) = cos²(α) - sin²(α)

Using this formula, we can simplify "cos α × cos α" as follows:

cos α × cos α = cos²(α) = 1/2 (1 + cos(2α))

So, "cos α × cos α" simplifies to 1/2 (1 + cos(2α)).