(§5.7, Q98) Show that the two regions in Figure 4 have the same area, i.e., show that V1 – x² dx : cos u du. Then, use the identity cos2 u = (1+ cos 2u) to compute the second area. (HINT: use the substitution x = sin u, for which u(0) = 0 and u(1) = 5.)

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