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Is uni seriously like this?

How do you prove the derivative of y=sin x is equal to sin(pi/2 +x) ? I know that's an identity but it says to prove right? Is there an actual method?

Is success one good for maths + ext?

Haha sure sure, have you progressed ahead in time or something? Your hsc is this year mate.

Hahaha okiees thanks

Thanks, should I almost rote learn past questions and hope they pop up? Like no exactly rote learn but you know

Cheers thanks

Mate, so where do we find these random pieces of info to rote learn anyway?

I'm gonna stop doing it now hahaha. Keep em in suspense why not

Apparently like heavier elements atomic no.>83 give off alpha radiation because it emits a helium nuclei and if you think about it and write an equation with it, you'll see that it becomes a smaller, more stable element much quicker than if it was emitting any other form of radiation. So alpha...

Hahahah no worries :) Naming IUPAC stuff: 1) Find the longest carbon chain (this will be your ending of the name eg -pentane) 2) Side chains/Double/Triple bonds: (Below dot points are listed in order of importance when naming) - Double Bond - Halogen (eg Br, F, Cl) - Hydrocarbon side chain (eg...

Question 5 Unstable nuclei have neutron to proton ratios outside of the zone of stability. It’s not option (a) because low atomic number elements are usually stable as seen in the zone of stability. Option (d) is incorrect because n: p ratio of 1 : 1.1 is roughly stable. For an unstable...

Heyy, got a sample question on you?

Do they usually pick a question out of the syllabus where it says "Students learn to"? Because I want to practice writing essays on stuff that will come up. So is that right? I mean, they've gotta stick to the syllabus anyway right?

Wow thank you soo much!! This is very helpful :D

Sorry sorry, can someone help me with this one? y=3sin2x - 4cos2x ? How to get the amplitude for this one? The auxiliary angle thing wont work cause it's a double angle am I correct>??

Ok, for the auxiliary angle thing you need sinx+cosx to equal something right? How do you do it without it?

Ohh okay thanks guys!! I will try and perfect my trig graphs. Some textbooks don't give you the full rules so I'll have to research it. Also, can you guys help me with how to find the amplitude of y=cosx + sinx ? Approximate answer is 1.4 but I don't get how to actually find it.

Like how do you sketch y= 1 + sin (pi/2)x ? These are too hard for me :( Is it sufficient knowing the basic ones where only the amplitude and period vary? regards

Thanks guys! 7 hours later I have finally finished the essay