kepala pusing:proving trigo -.-

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Assalamualaikum wbt...

dah lame x update blog ni...tadaaa! dah tuka blogskin lagiii..-.- yg haritu dah tukar,demi mneruskan hidup yg baru :D (k,xder kaitan ._.)..hmm,bnyak bnda yg blaku,nanti lah aq cerita satu2,tapi bukan sekarang kot.sbb xder mood .n bkaitan dgn novel pndek aq tu,aq x smbung2 lg,sbb x der idea n xde intro nk smbung part 6..hewhew http://www.smileycodes.info

and for today,aq nk cerita sal proving trigoo..hoho ilmiah -.-
aq just nak share2 jer,aq sndri pun masih merangkak2 dlm trigo nih..nasib baik ayah aq cg math >.<
sbnarnya,aq agak suka soalan2 proving2 nih..sbb jwapan mmg dah ade situ..juz nk tnjuk jlan kje,kan?kan? :Dhttp://www.smileycodes.info
tp,smlam ....otak aq buntu giler,rase nk meletup,frust -.-
aq xleh nk prove pum,T.T
http://www.smileycodes.info
so,aq abik kesempatan untuk tuka blogskin ,haih. -.-(tp,xpelah skrg cuti midsem,klu aq duk kat palam,mmg x sempat nk tuka blogskin bagai)

so,pagi tadi,aq tak tido :D.hebakkk kan?
and aq selsaikan 4 soalan proving dgn bntuan ayah aq dgn pakcik google..*Thanks :*
aq nk taip satu2 pum,ase mlas..so aq tnjuk kan lah soalan proving trigo yg (bagi aq) agak susah,(ataupun aq mmg lmbab -.-)

Disebabkan ,ade power square,cube bagai,aq copypaste dri ask.com je lah..kbetulan soalan tu same ngn tuto aq..Canada Answer lg tawww..hebakkk http://www.smileycodes.info

sin3A - sinA = 2sinA - 4sin^3A

 >> use trig identity sin(x+y) = sinxcosy + sinycosx

sin3A = sin(2A+A)
sin3A = sin2AcosA + sinAcos2A
sin3A = (2sinAcosA)cosA + sinA(1-2sin²A).....

 << sin2A = 2sinAcosA;...cos2A = 1 - 2sin²A

sin3A = 2sinAcos²A + sinA - 2sin^3 ²A
sin3A = 2sinA(1 - sin²A) + sinA - 2sin^3 ²A
sin3A = 2sinA - 2sin^3 A + sinA - 2sin^3 ²A
sin3A = 3sinA - 4sin^3 

 tadaaaa!done,hebakk,sape yg jawab ni via KY

thank youu~~

k,other example:

prove (sinA+cosA)²-sin 2A=1
; use trig identity sin 2A=2sinAcosA

 sin²A+cos²A+2sinAcosA)-2sinAcosA=1

; use trig identity cos ²A+sin²A=1

 sin²A+cos²A=1......Proven

 k done,yg ni simpler dr yg first tu.
Setkat ni dulu kot,k baiii 
http://www.smileycodes.info


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