Recent content by ZaZu

I just checked back on this topic ! Thank you very much ephedyn, that was really helpful ! Thank you ! REally appreciated :) :)

Hmm I think I do have some errors in the signs. The answer in the sheet is : http://img149.imageshack.us/img149/7731/image357f.jpg So you're right, using whatever way its the same answer !

Hmm so I should ignore what this answer sheet is telling me, because its following a different method other than LITE. Its substituting e for U instead of cosx .. Thanks :)

Hmmm, I really do not know Euler's formula, my exam is tomorrow so I don't think I would be very safe learning it today, might mix up tomorrow. So other than Euler's formula, is using LITE good enough ? Our tutor told us to use LITE, so perhaps in the exam ill just indicate that I am using THAT...

I tried taking the trig function for U but the answer sheet gives a different answer, it used u = exponential function What way do you recommend ?

One last thing, Umm I want to ask another question that does not really need a new thread. In integration by parts, which function has the priority to be substituted as U I follow the method of LITE L = Logs and Ln I = Indices T = Trig Functions E = Exponents But integrating e^x.Cos(x) The...

Thank you :)

Ok I solved Sin^2(x) My answer is x - 1/4[Sin2(x)] However, I think the x is missing the something .. Did I do something wrong ? [edit] Got it, the 1/2 is multiplied to the whole side not just Cos2x .. :) Is my answer correct now ? x/2 - 1/4 [Sin2(x)]

Yes I will solve that, I am sure I will get the correct answer .. Regarding your previous post, I already have a list infront of me, which by some unknown way I did not use at all to figure out my problem in the first place.. http://img89.imageshack.us/img89/1392/image356.th.jpg Thank...

Oh my God .. ! The whole process was just to re-arrange the identity .. how can I miss that :"( ahhh ! Thanks guys ! THANK YOU SO MUCH @ Danago : The thing is I still did not revise the past lessons, so I feel nervous by thinking * Oh I still did not finish this and I still have other...

Oh so they are EQUAL ?? oh .. Ohhhh I got it ! Omg thank you so much Danago, and thank you all who replied ! Thanks a lot ! Btw, anyone got a way to avoid being nervous from the exam ? Its really a pain in the head .. I don't want it but I can't help not panicking =\ [EDIT] @Cyosis If...

Cyosis I am having a difficulty understanding what they are telling me, I do not know why, I thinks its nervousness prior to exams. I am panicking .. Are you asking me to solve Cos^2(x) as in integrate Cos^2(x) ? By the way, I am sorry everyone, my brain is just not tolerating a thing anymore...

I do know some of the trig identities, but I do not understand how using them here can help me. But I came up with this rule : If the index is an EVEN number, I double the angle. If the index is an ODD number, I use the trig identities to substitute instead. Cos^2(x) = Cos(2x) Cos^3(x) =...

So you're saying that its a rule I should memorize ??

Yeah I mentioned it up there, I just realized I solved for Cos^3(x) xD The thing is, I don't understand WHY would I convert it into cos2x even if I used the trig function of Cos2(x) = 2Cos^2(x) - 1 ..