Fill in the blanks: 11. states that if f(x) is a continuous function defined on closed interval [a, b] and F(x) is integral of f(x). 12. f(x)dx = F(x), then f(x)dx=F(x)] = F(b)-F(a) 13. In Fundamental theorem of integral calculus, a is called lower limit, b is called upper limit and F(b) - F(a) is called the.......... ................of the definite integral. 14. The Fundamental theorem of integral calculus is very useful as it gives us a method of calculating the definite integral more easily without calculating the........ 15. The crucial operation in evaluating a definite integral is that of finding a function whose derivative is equal to the ..............