Question

Cos60°+2 sin30°-3ctg 45°​

Answer 1

Ответ:(-3/2)

Объяснение:

На фото

Answer 2

Let's calculate the value of the expression step by step:

1. cos(60°): Using the unit circle or trigonometric identities, you can find that cos(60°) = 1/2.

2. 2sin(30°): Using the unit circle or trigonometric identities, you can find that sin(30°) = 1/2. So, 2sin(30°) = 2 * 1/2 = 1.

3. 3ctg(45°): The cotangent (ctg) of 45 degrees can be found using the reciprocal of the tangent (tan) function. Since tan(45°) = 1, ctg(45°) = 1/1 = 1.

Now, let's put it all together:

cos(60°) + 2sin(30°) - 3ctg(45°) = (1/2) + 1 - (3 * 1) = 1/2 + 1 - 3 = 1/2 + 1 - 6/2 = (1/2 - 6/2) + 1 = (-5/2) + 1 = -5/2 + 2/2 = (-5 + 2)/2 = -3/2.

So, the value of the expression is -3/2.