[tex]f(x)=cos(x+1)+sin(x-2)[/tex]
Interval: [tex][-\frac{\pi}{2},\frac{\pi}{2}][/tex]
Subintervals: 12
Estimate the area under the curve using left endpoint rectangles.
Express your answer in summation notation and then expand the summation into function form. Then estimate the summation to the nearest thousandth.
