True or false

sin2(x) + cos2(:c) = 1 sin(x) = sin(:c) _ A student used left-hand Riemann sums to estimate the area under the graph of f over an interval Where the graph was decreasing. This was an underestimate of the actual area. Assume that f is a continuous function and that F is any antiderivative of f. Then I: t) dt = F(a) F(b). _ If f is continuous for a S :5 S b, then f: f(:c)d:13 = 0