Recent content by mathyics

why doesnt nail rust in a NaOH solution? i thought na is more reactive so it will give him electron to the fe?

umm so i have to build a generator but my understanding of it is very poor and when i look at the explanation from the textbook i don't seem to get much out of it :( i know that a DC generator converts mechanical energy * -> electrical energy. The coil rotates because of the magnetic field and...

what is the product when ethanol + OH- ???

i dont think that equation works for 3 (odd): (-1)^3-1 * 3^3 cos3x = 1 * 27 cos 3x = 27 cox 3x but y'''=-27cos3x I have now found a new equation which works for 1-3 (proven) and i think it will work for odds how do you guys think?

sorry it should be the 50th derivative

This topic i think is differentiation on trigonometry function. Also this would be the exam question and the teacher has only told us just before the end of lesson so i really need help on this. Also is it even possible to have a general formula for this? i asked a friend and he said there will...

Find the first, second, third, fourth, fifth derivatives of the function y = sin 3x. Find the rules that can help to find the 50th derivative of the function. It's urgent! My attempt to the question: y = -a^n sin ax for even...

Just wondering how to factorize this (2x^4-3x^2+x)^1/2 would that be x^1/2(2x^3-3x+1)^1/2 or x(2x^3-3x+1)^1/2 or neither?:hammer:

They will most likely be teaching simplified Chinese:angry: If you are learning Chinese for your future career than I suggest you learn simplified Chinese. It is much more popular and useful than traditional. Traditional is only used in HK and Taiwan. (Although I like traditional chinese...