Question

Cos80cos20+sin80sin20

Answer 1

Cos(60) должно быть так

Answer 2

Ответ:

-0.95241298041

Объяснение:

надеюсь помогла ._.

Answer 3

The expression you've given, cos(80)cos(20) + sin(80)sin(20), is an example of the trigonometric identity known as the angle sum identity for cosine:

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

In your expression, A = 80 degrees and B = 20 degrees, so:

cos(80)cos(20) + sin(80)sin(20) = cos(80 + 20).

Now, simplify the angle inside the cosine:

cos(80 + 20) = cos(100) degrees.

So, cos(80)cos(20) + sin(80)sin(20) is equal to cos(100) degrees.