Please help with practice example problem 1 and 2.

1.

Using the R N approximation, express the area under the graph f (x) = 9 sin(x) over [0, a as a limit. Select the correct value. Evaluate the two integrals given the graph. The two parts of the graph are semicircles. 4 6 f f (x) ab: and f If (x)| dx 1 1 3' y =f(x) (Give an exact answer. Use symbolic notation and fractions where needed.) 4 / f(x)dx = l l 6 [I |f(x)|dx= |