To find the value of the given expression, we will first determine the values of each trigonometric function at the specified angles:

cos(30°) = √3 / 2
sin(30°) = 1 / 2
tan(0°) = 0

Now, we can substitute these values into the expression:

cos^2(30°) - sin(30°) - tan(0°)
= (√3 / 2)^2 - 1 / 2 - 0
= 3 / 4 - 1 / 2
= 3 / 4 - 2 / 4
= 1 / 4

Therefore, cos^2(30°) - sin(30°) - tan(0°) = 1 / 4.