It is the circumference of a circle divided by the radius. It is an irrational constant, it cannot be expressed as a fraction so it is represented by a greek letter for simplicity's sake. It is frequently approximated as 3.14, but it has an infinite number of digits.
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Can you please claify if you mean x=y^2/ pi*cos(x) , or x=y^2/cos(pi), since they are very different sums.
A = (pi)r2 A/pi = r2 √(A/pi) = r
pi/4 radians = 45 degrees. 2pi radians = 360 degrees pi radians = 180 degrees pi/2 radians = 90 degrees pi/4 radians = 45 degrees pi/3 radians = 60 degrees. et seq.,
The 1000th digit of pi is...9
The answer is:cos (pi/2) = 0