Integration (1 Viewer)

[letsdie45]

Hey guys... how do i start this,



thanks

 

[Tofuu]

hmm, i would start it by turning 8cos^4 x into 8cos^2 x cos^2 x [which you can turn one of the cos^2 x into 1-sin^2 x]

and then if you expand that out, the -8cox^2 x should cancel out

 

[Tofuu]

mey i ask what was the answer (from the book)

 

[letsdie45]

thanks ill try it out now.

answer was [-sin4x/4]

 

[Tofuu]

thanks ill try it out now.

answer was [-sin4x/4]

i got sin4x/4

 

[letsdie45]

hmm, i'm still stuck >.<

i got up to
-3x +2 sin[2x] = 4S(1-2 cos[2x] + cos^2[2x])

 

[xV1P3R]

 

[Drongoski]

 

[letsdie45]

thanks guys

 

[Tofuu]

this


if your not sure about the






so it will be

now;


subbing back in

 

[Tofuu]

thanks guys

this


if your not sure about the






so it will be

now;


subbing back in

=.=, typing in LaTEX is long

 

[Drongoski]

Re: Tofuu

I've carried in my head for the last umpteenth years the following identities:






Knowing this set of identities like the back of my hand has served me very well.