It is pi/2 + 2*k*pi radians for integer k.
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The maximum of the sine and cosine functions is +1, and the minimum is -1.
What are the likely maximum and minimum values for this measurement 20.4+_0.1cm
Try calculating the sine functions on a scientific calculator, then do the division. And make sure the calculator is set to the correct angular measurement (radians, or degrees, whatever you want to calculate).
You cannot. Sine is a ratio, degrees are a unit of measurement for angular displacement. The two measure different things and, according to basic principles of dimensional analysis, any attempt at conversion from one to the other is fundamentally flawed.
sine 810 = sine 90 = 1