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Is there a musical term for two independent, non-complementary, parts being played simultaneously? What about for three parts? Find Marginal Cost from total cost function (P^2)A(P)? Questions for medicine I could not get it and I need your help? How to locate/take pictures of planets? Problem involving math induction! If m and n are distinct real numbers, prove that (m+2)^2 = (n+2)^2 if and only if x+y=-4?