Question

Cos(47°) cos(43°) - sin(47°) sin(43°)

Answer 1

Ответ:cos90=0

Объяснение:

Answer 2

To calculate the value of the expression cos(47°) cos(43°) - sin(47°) sin(43°), we can use the trigonometric identity:

cos(A - B) = cos(A) cos(B) + sin(A) sin(B)

Let's denote A = 47° and B = 43°. Substituting these values into the identity, we have:

cos(47° - 43°) = cos(4°)

Therefore, cos(47°) cos(43°) - sin(47°) sin(43°) is equal to cos(4°).

Using a calculator or a trigonometric table, we can find that cos(4°) ≈ 0.99939.

Hence, cos(47°) cos(43°) - sin(47°) sin(43°) ≈ 0.99939.