Question

Ctg 90+3cos60-4 sin 270

Answer 1

Ответ:

$0 + 3 \times \frac{1}{2} - 4 \times ( - 1) = \frac{3}{2} + 4 = \frac{11}{2} = 5 \frac{1}{2}$

Пошаговое объяснение:

Я сразу решение написала

Answer 2

Ответ: решение на фото.

Пошаговое объяснение:

Answer 3

To evaluate the expression "Ctg 90+3cos60-4 sin 270," let's break it down step by step:

1. Ctg stands for the cotangent function, which is the reciprocal of the tangent function. The cotangent of an angle is calculated by dividing the cosine of the angle by the sine of the angle.

2. The given expression contains three terms: 90, 3cos60, and -4sin270. Let's evaluate each term separately:

   • 90: This is a constant value of 90.

   • 3cos60: The cosine of 60 degrees is 0.5, so we multiply it by 3: 3 * 0.5 = 1.5.

   • -4sin270: The sine of 270 degrees is -1, so we multiply it by -4: -4 * (-1) = 4.

3. Now, let's substitute the evaluated terms back into the original expression:

   Ctg 90 + 3cos60 - 4sin270 = Ctg 90 + 1.5 - 4

4. Since the cotangent of 90 degrees is undefined (because the tangent of 90 degrees is zero), we can't determine the exact value of the expression. However, we can simplify it further:

   Ctg 90 + 1.5 - 4 = Undefined + 1.5 - 4 = Undefined - 2.5

Therefore, the simplified form of the expression "Ctg 90 + 3cos60 - 4sin270" is "Undefined - 2.5."