Let's break down each term:

Cos60 = 0.5
2sin30 = 2(0.5) = 1
1/2tgквадрат60 = 1/2 * tan^2(60)

First, find tan(60):
tan(60) = √3

Now, calculate tan^2(60):
tan^2(60) = (√3)^2 = 3

Therefore, 1/2tgквадрат60 = 1/2 * 3 = 1.5

Then, ctg(45) = 1/tan(45) = 1

Now, plug in the values:

Cos60 + 2sin30 + 1/2tgквадрат60 - cтg45 = 0.5 + 1 + 1.5 - 1 = 2

Therefore, the final answer is 2.