Hi,

Need to prove

A. integral from pi to 2pi of (|cosx|)/(x^2) dx <= 1/2pi

B. 1/4 <= integral from 0 to 1 of (x+x^3)/(1+x+x^5) dx <= 3/4

Need to use the theorem that says:

1. If f is integable(has an integral) in [a,b] and for every x there is f(x) => 0

then

integral from a to b of f(x) => 0

2. if f and g are integrable in [a,b] and for every x there exists

f(x) => g(x)

then

the integral from a to b of f(x) dx => the integral from a to b of g(x) dx

It gives me a headache.

Please help, thanks!