Quiz 9 The temperature u(, t) in a bar of length of 4 units obeys the equation at 0 0 dac 2 and we solve the equation by assuming separation of variables of the form u(x, t) = F(x) . G(t), for 0 S x Bn sin (Innx) e lit. n=1 The initial temperature distribution is u (x, 0) = 7 sin (7 x) + 2 sin (3 x x). Calculate the exact values of Bn as requested below and enter them in the boxes. BA = Bg = B12 =