Question

1 - cos2 L = ?????????????????????????/

Answer 1

Решение:
1 - cos2α = cos²α + sin²α - (cos²α - sin²α) = cos²α + sin²α - cos²α + sin²α = 2sin²α.

Answer 2

To simplify the expression "1 - cos^2(L)," we can use the trigonometric identity:

1 - cos^2(L) = sin^2(L)

This identity is known as the Pythagorean trigonometric identity for sine and cosine. It states that the square of the sine of an angle (sin^2) is equal to 1 minus the square of the cosine of the same angle (1 - cos^2).