Recent content by jinglebells1464646

Should have observed that. Also I got my line formula wrong, should by y=mx not x=my. Thanks

Hi Everyone, This is the q29 of the 2019 Chemistry HSC question. My answer is at the very bottom (method: find the equation of the lines of best fit and then plug in values to get output. It is wrong though. The answer was that the treatment was effective for Cu ions but not for Pb ions. Anyone...

I don't know how to do C. Here my working. I used the fact that "modulus of cross product of two vectors = area of the parallelogram enclosed by those vectors" The base/floor/subscript vector in the projection expressions is the arbitrarily chosen vector (1,1,0) which has a z=0 coordinate since...

but based on your results as you put it under, shouldn't you have classified for a 99+?

so my school is ranked in the 10s to mid 20s, I got 75% for my first ext 1 maths internal, the average was 60% but my ext 2 math was 88% and average was 78% and highest was about 94% my chemistry was 90%, average was 70-ish% my English was 18/20 (average unknown) and highest was 20/20 and my...

Hi everyone, so for extension 2maths, can people contribute a list of results that, although obvious, would require proof before being used in the exam? For example, I wonder if you can only apply the triangle inequality and Cauchy-schwarz vector version inequality after proving it somewhere...

What is the difference between how the "two texts collide, align or mirror each other in a certain aspect" versus how the "two texts explore common issues, etc"? Arent they just both synonymous versions of "What is similar and what is different between their presentation of ideas?"

could you elaborate on "angle sum identites". Did you mean compound angle formulas?

can I ask, if I got like say between 80 and 90 for the first extension 1 task, do I still have a chance to get 99+ atar?

Hi everyone, So for both extension 2 and 1, which of the identities in the Reflections, shifts, and periodicity category of the wikipedia page on "List of trigonometric identities" do I need to know? I somehow can't attach the link

is there anyone here who is really qualified for private tutoring extension 2 confidently and seriously?

Hi Everyone, Would someone please kindly supply some criticism for this following past paper? I did one for abbot sleigh recently and there was some constructive feedback for that one too if people want to check it out so maybe this thread might help as well.

is it possible to do this question without using cosine rule? using just pure vectors?

okay so could you provide some constructive feedback