Approximate the area under the curve graphed below from w = 1 to a: = 5 using a Left Endpoint approximation with 4 subdivisions. n Express the limit lim (2 cos? (27a* ) + 8) xi over 7, 8 as an integral. n-+ 0o i =1 Provide a, b and f(x) in the expression f(x) dx. a a b f (ac) =