(4 pts) Estimate the area under the graph of
f(x)=(1)/(x+1)
from
x=1
to
x=2
using four approximating rectangles and right endpoints. (12 points) Evaluate the integral.
\int (3x^(2)+(3)/(x^(2))-(1)/(x)+5^(2))dx
(
:\int csc^(2)x-cosx+sinx