Oooh, thank you thank you.Pwnage101 said:i'm not namu, but can i answer the Q? lol
well they are basically the same
ull neva be asked to 'use the reveers chain rule
but basically, with the reverse chain rule technically u do use a substitution in ur head, but when u sub in du it turns out 'nicely' ie:
INT (sinxcosx).dx
now u could use a substituion like u=sinx, but by using 'the reverse chain rule' u notice that this will yield an answer that is (1/2)(sinx)^2 + C - ie when u sub in du=cosx.dx it turns out as INT u.du, which is a very simple function, so technically they are the same thing - we call it 'ther reverse chain rule' because when u derive something via teh chain rule, u multiply teh function by it';s derivative at the end, and so if we have an integration with a function multiplied by its derivatrive, its sorta the revers, and that derivcative disappears
if u dont get it, just use a substitution, its the SAME THING, ur just doing more owrking out on the page, which is a good thing!
BUT dont worry about it
if u do 4U u'll get the hang of things and itll be much smoother in the integration chapter
I get it now.