"Pi divided by 2" is a number, i.e. a constant.
The derivative is the rate of change. The derivative of any constant is zero, because a constant never changes.
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(1/2(x^-1/2))/x
Well if you have 5/X then you can rewrite this like 5x-1. And the derivative to that is -5x-2 and that can be rewrote to: -(5/x2).
The formula for the diameter is circumference divided by pi. In this case, 3 divided by pi (= 0.95) then to get the radius just divide by 2. 0.95 divded by 2 = 0.48
No, the circumference of the circle divided by the diameter is pi.
22/pi is approximately 7.0028175