Cos60 2 sin 30 0,5tg^2 60 - ctg45=

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To solve this, we can first convert all the trigonometric functions to their respective values:

cos 60 = 0.5
sin 30 = 0.5
tg 60 = sqrt(3) = 1.732
ctg 45 = 1

Now, we can substitute these values back into the equation:

0.5 2 0.5 - sqrt(3)^2 - 1 = 0.5 - 3 - 1
= -3.5

Therefore, the solution is -3.5.