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just a quick question guys why is the triangle inequality a + b >= c? why equal to? i was doing the 2001 hsc paper again this morning and Q8a part ii says a,b and c are three sides of a triangle. surely if equality holds then they are three sides (?) of a straight line? and you no longer...

hi guys, just wondering, when u use the substitution t = tan(x/2), pretty much everyone memorises that dx = 2/1+t² dt.. do we have to show working in getting from t=tan(x/2) to this every time or is it ok to just write it down straight away?? same goes for the sinx, cosx etc...

hi guys, just checking if anyone's figured out question 16 part c in this exercise .. i've got the first 2 parts, and i know how to get the answer for part c, but i cant figure out why that's the answer :P following on from part b, x = 2gR / 2gR - V.. i'm fine with that. the answer says...