Evaluate (be careful if n = m) L 0 sin nx L sin mx L dx for n > 0,m> 0. Use the trigonometric identity sin a sin b = 1 2 [cos(a b) cos(a + b)] .

L21 - 6 ex. Aditbedofitbyugi through an inverted cone-shaped ﬁlter. The height of the cone is 20 inches and the diameter across the top...