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Hi, I'm looking for answers to these questions if someone could help out, as I'm a bit rusty and am helping a friend.. (arcsin = sin^-1 doesn't it?) Domain and Range of: xcos^-1x (xarccosx) xsin^-1x (xarcsinx) mainly range I got stuck on. Derivitive of: tan^-1(1/x) + tan^-1x...

Ok, I've been having a dumb moment for a while... Someone has asked me to explain quadratic factorisation (year 10 stuff), but I never learnt the cross method - always did it another way.. So is anyone able to give me a quick rundown on the cross method?? (used to factorise quadratics when...

need a bit of help with a shm question.. I'm posting it from what I remember when I saw it this arvo (don't have a copy of it with me now) so hopefully I get it right Anyway, the equation was x = asinnt + bcosnt And we were asked to find v and a which was easy Then asked to find period and...