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e^-x^2 doesnt integrate to e^-x^2/-2x didnt you read the other posts?

no -sqrt(-1) would be -i

i didnt do the cssa paper but i got 81/84 all my mistakes were stupid such as writing the answer off my calculator incorrectly so im a bit disappointed, i was first by about 8 marks

but they also want to make part of the exam multiple choice from what ive heard which i think is dumbing it down students shouldnt be able to just randomly guess a,b,c,d in ext 2 maths

dont bother with study for sc its a waste of time

yeah you can definately integrate atanx using ibp its just x.atan[x] - .5ln(1+x^2)

so whats the deal with this error function thing 3 unitz??

what was the answer in the back of the book??

two unit don't learn the remainder theorem or long division do they?? how else could they do it??

umm break it up intox.xe^-x^2? then use integation by parts? letting u=x and v'=xe^-x^2 then u'=dx and v=-.5e^-x^2 is you get [(-xe^-x^2)/2] +.5 Se^-x^2 dx thats all i can think of doing not sure if it correct tho this wasnt in a 3 unit text book was it?? EDIT: im obviously wrong if...

two people at my school =] i think its the best way to learn

how come you didnt?? you seem to love maths

o so you didnt do 4 unit??

you didnt learn substitution at high school???

yeah its not very nice just stick to the substitution but im impressed that your teaching yourself four unit integration techiniques

no i dont think i.b.p would work here but even if it did it would be really unneccesarry what were you planning to do let u=rt(5-x) and v'=rt(5+x)dx???

wow you taught yourself how to do that? impressive

nah the only way theyd ask you that is if it had the limits -5 >5 or 0>5 so you can just do the area of a semi circle or quarter circle

what about q8??