Question

Sin (− 4 ) + cos 3 + cos (− 6 )

Answer 1

Вот решение. Удачи в учебе!

Answer 2

To evaluate the given expression, let's first calculate the trigonometric values and then perform the addition:

1. sin(-4): The sine function is an odd function, which means sin(-x) = -sin(x). sin(-4) = -sin(4)

2. cos(3): We can directly evaluate the cosine of 3. cos(3) ≈ 0.9986 (rounded to four decimal places)

3. cos(-6): The cosine function is an even function, which means cos(-x) = cos(x). cos(-6) = cos(6)

Now, we have: -sin(4) + cos(3) + cos(6)

Without further information about the angles, we cannot simplify this expression any further. So, the final result is in terms of the trigonometric functions. If you have specific values for the angles (4, 3, 6), you can plug them into a calculator to get a numerical result.