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North Shore may use teachers, but most of them are NOT GOOD, and the material is shithouse (maths is ok i suppose). good uni students who have experience of the hsc are in many cases better.

for 1), other reasons why NaOH is not a good primary standard: it has a low molecular mass, so weighing errors will be amplified it reacts with carbon dioxide in the air: NaOH + CO2 ---> Na2CO3 + H2O

it'll work try int. by parts with v' = sinx and u = sinⁿֿ¹x

well its SIDE (ie x) is increasing at a rate of 0.12, not its VOLUME (V) so dx/dt (the rate of change of the side) = 0.12

dx/dt = 0.12 (given) V = x^3 dV/dx = 3x^2 so dV/dt = dV/dx * dx/dt = 3x^2 * 0.12 = 3(150)^2*0.12 when the side is 150 = 8100 mm^3/s

for the first one, split sinⁿx into sinⁿֿ¹x.sinx and then apply integration by parts. similarly split secⁿx into secⁿֿ²x and sec^2x and do likewise. wat kfunk just did :)

bump......

typically integration is at the start but ANYTHING can come up ANYWHERE ive seen a hard newton's method in q8

crazy browser is a good mask for ie

rearrange the series like this: 5 + 10 + 15 ...- 2 - 8 - 32... recognise the 2 series?

still havent started individual aaargh :(

yep, sorry abt that it still works, just replace the a in the working with a^2

bump.........

for the locus, y = a(p^2 + q^2)/2 x = a(p+q) now 3x^2 = 3a(p^2 + q^2 + 2pq) from the result in b, 2pq = -(p^2 + q^2)/3 so 3x^2 = 3a(p^2 + q^2-(p^2 + q^2)/3) = 2/3*3*a(p^2 + q^2) = 2a(p^2 + q^2) = 4ay

nah mate its concave up think abt it some more: as x goes to +/- infinity, y goes to?

you can go look it up at the CSU website

30-35? damn i only charge 25. well thats probably right for a 1st year uni student. btw do we post our details in this forum now?

umm im afraid ull have to come up to UNSW you can try nit, he lives in hurstville

bump.......

i never bother looking at profiles :) graduated a while ago too, ey?