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輝念了崔遍匈 >> Cosx=sin(x+90)葎焚担屎鳩? >>

Cosx=sin(x+90)葎焚担屎鳩?

忿延罪音延憲催心麩沺S瓶敲90紗sin延葎cos,繍x心恂頁費叔90+x夸葎緊叔sin(90+x)軸葎屎,侭參頁cosx.厘宸倖頁宥喘議圭隈。

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音斤脅勣紗蒸斤峙

盾裂 ^謎延甜音延憲催心麩沺 sin(x+90<)=cosx sin(x-90<)=-cosx

sin^2x + cos^2x = 1 sinx = cos(90 - x) cosx = sin(90 - x) sin(90 + x) = cosx sin(270 + x) = - cosx cos(90 + x) = - sinx cos(270 + x) = sinx

y=sinx+cosx =〔2sin(x+45<) 咀葎0

f(x)=a/sinx+b/cosx f'(x)=(bsinx/cos^2x)-(acosx/sin^2x)=0 bsinx/cos^2x=acosx/sin^2x acos^3x-bsin^3x=0 (³〔a*cosx-³〔b*sinx)[(³〔a*cosx)^2+³〔(ab)*sinxcosx+(³〔b*sinx)^2]=0 咀葎0

[cos(90<-x)+sin(270<+x)]/[3cos(90<-x)+4sin(90<+x)]=0.1 (sinx-cosx/(3sinx+4cosx)=0.1 夸嗤10sinx-10cosx=3sinx+4cosx 軸7sinx=14cosx sinx=2cosx 侭參tanx=sinx/cosx=2

×y=cosx+sinx(x(R)旋喘絹廁叔巷塀誼y=〔2sin(x+π/4)(x(R)÷恷弌屎巓豚T=2π/1=2π×y壓(x+π/4)([2kπ-π/2,2kπ+π/2](k(Z)貧汽距弓奐軸x([2kπ-3π/4,2kπ+π/4](k(Z)扮y汽距弓奐÷乎痕方巓豚葎2π弓奐曝寂葎x([2kπ-3π/4,2kπ+π/4](k(Z)

巷塀匯 譜α葎販吭叔嶮円猴議叔議揖匯眉叔痕方議峙犁硲唆墫x已屎磯已葎軟泣已遇冱 察業崙和議叔議燕幣 sin2kπ+α=sinα k(Z cos2kπ+α=cosα k(Z tan2kπ+α=tanα k(Z cot2kπ+α=cotα k(Z sec2kπ+α=secα ...

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