Figure 1 below shows the curve y=e2xy = e^{2x}y=e2x for x>0x > 0x>0. The point P(x,y)P(x, y)P(x,y) lies on the curve, and the rectangle shown shaded has height y y\,y and width δx\delta xδx.
Find the exact value of
limδx→0∑x=25e2x δx\displaystyle\lim_{\delta x \to 0}\sum_{x=2}^{5} e^{2x}\,\delta xδx→0limx=2∑5e2xδx
363 exam-style questions on CCEA A Level Maths 3.6 Integration (A-level only), covering 3.6.1 Integration (A-level only), 3.6.2 Integration (A-level only), 3.6.3 Integration (A-level only), 3.6.4 Integration (A-level only), 3.6.5 Integration (A-level only), 3.6.6 Integration (A-level only), and 3.6.7 Integration (A-level only). Each one has a worked solution and a mark scheme showing where the marks go.