Question

Cos 225°Помогите плиз срочно​

Answer 1

Ответ:

cos(180+45)=-cos45=-sqrt(2)/2

Объяснение:

cos 225 = cos (Pi+Pi/4) рисуем радиальную окружность и смотрим чему равно значение косинуса в общем получится должно минус корень из двух деленное на 2

Answer 2

Відповідь:

√2/2

Пояснення:

перетворимо cos225° таким чином:cos(270°-45°)=cos45°=√2/2

Answer 3

Cos 225°

To find the value of cos 225°, we can use the unit circle or trigonometric identities.

The unit circle is a circle with a radius of 1 unit, centered at the origin of a coordinate plane. The angle is measured in the counterclockwise direction from the positive x-axis.

To find the cosine of an angle on the unit circle, we can look at the x-coordinate of the point where the terminal side of the angle intersects the unit circle.

For the angle 225°, we can find its reference angle by subtracting 180° from it. The reference angle for 225° is 45°.

On the unit circle, the point where the terminal side of the angle 45° intersects the unit circle is (√2/2, √2/2).

Since the x-coordinate represents the cosine of the angle, the cosine of 225° is √2/2.

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