Examples
Input:
area(x^2,x=0..1,8,trapezoid)
Output:
0.3359375
Input:
area(x^2,x=0..1,8,rombergm)
Output:
0.333333333333
Input:
area(x^2,x=0..1,3,gauss15)
Output:
0.333333333333
Input:
area(x^2,x=0..1)
Output:
1
3