Release Notes: If y=1/((a^2)*(x^2)), then integral (y)dx=arctan(x/a)+c, where 'a' is a constant and 'c' is the integration constant. When the y vs. x curve is drawn, the area under the curve from x=0 to x=a is [arctan(a/a)-arctan(0/a)]=pi/4. In this program, the area under the above mentioned curve from x=0 to x=a is calculated by dividing the area into a number of thin strips. The width of each strip along the x-axis is unity. The value of 'a' should be input by the user. The sum of the area of all the strips is multiplied by 4 to calculate the approximate value of pi.