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Hi guys, I'm doing this exam question and need some assistance. 1. Given y=sininverse(cosx) (i) Find dy/dx I don't understand why the answer is y dash = -1 for 0<x<pi or = 1 for -pi<x<0 My working out was y dash = -sinx/absolute values(sinx) I don't understand the...

Can someone please explain this statement, espescially the one underlined: "DC motors and generates are similar, but the terminals of a motor go to a voltage source, while the terminals of a generator go to a load. The motor is the load in a DC motor.

My question: I know that if the coefficients of P(x) is real, that means the complex conjugate is real if there is a complex root. However, what if there is a surd root? e.g root5, would the conjugate -root5 also be a root?

So I watched this movie Fight Club, and there was this scene where Tyler kisses this guys hand to wetten it, and puts lye (sodium hydroxide) on it. I know that sodium hydroxide is a strong alkaline, which means "a base that dissolves in water". So washing sodium hydroxide off with water, would...