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Is it necessary to state that in the exam? Also, how do you find domain and range of this 3sininverse(root(1-x^2))

Yeah, but what I don't understand is the given domain? Like in the solutions it was: = -1 for 0 less than x less than pi and = 1 for -pi less than x less than 0

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...

Thanks I got it!

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.

When you say rational coefficients, you mean where numbers can be expressed as a fraction right? Also, I have another question: P(z) = z^4 + (1-2i)z^2 -2i. i is a root of this equation. Explain why -i is also a root. I can't talk about the conjugate root theorem right? So how do I explain...

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?

Re: HSC Chemistry Marathon 2016 Actually, you're right Leehuan. The questions too hard, and not required for the HSC. _____________________________________ NEXT QUESTION: 1. 2L of concentrated (10M) hydrochloric acid was spilled in a laboratory accident. Three substances were considered for...

Re: HSC Chemistry Marathon 2016 For fun

Re: HSC Chemistry Marathon 2016 ______________________________________ I might be mistaken, but should the state of water in the products be liquid and not gas? If not, can anyone explain why its in a gaseous state. There has been a debate going on at my school, that the products of ethanol...

Re: HSC Chemistry Marathon 2016 [deleted]

Re: HSC Chemistry Marathon 2016 I don't think anyone has gone that far into Acidic Environment or even started it. I'll post up a POM question and afterwards people who've started it, can answer it. _________________________________________ Question: Iodine-131 is a radioisotope that is...

lmao I love ur blog

Ooo okay thank you!

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...