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ΪʲôCos(%x)=Cosx

cos-x)=cosx֤£ cos(x) = cos(0-x) -x0-xʾ0-x-x = cos0cosx+sin0sinx õ˹ʽcos ( ) = cos cos ∓ sin sin = cosxsin0=0cos0=1Եó չϣ ͽǹʽ 1si...

Ϊy=cosxż cos(-x)cosx

¥cos[cos(cosx)]sin[cos(cosx)]Ǵģ Ҫ֤һ󣬽ٳһɡ žһ x=1()ʱУ cosx=cos10.54030231 cos(cosx)=cos(cos1)0.85755322 sin[cos(cosx)]=sin[cos(cos1)]0.756243...

Ϊڵ1͵4cosǵķŶһġ

d(cosx)/cos²x,cosx=u,ԭʽdu/u²=-d(1/u)=-d(1/cosx)

1ݹʽcos(A+B)=cosA*cosB-sinA*sinB, A=B=Xɵùʽ 2ԭʼ֪ʶʼƵ ȽֱϵֱϵxOyλԲOa,b-bʹaĿΪOxԲOڵP1ձ߽ԲOڵP2bʼΪOP2ձ߽ԲO...

ش Ͳʽ3coscos=1/2[cos+£+cos£] 2coscos=cos+£+cos£ =2 x= xʱʽã 2cos2xcosx= cos3x+ cosx2cos2xcosx=cosx+cos3x

Ϻ󵼡

cos(x+y)-cosx=0 2SIN(x/2)SIN(x+y/2)=0 SIN(x/2)=0SIN(x+y/2)=0 x/2=kлx+y/2=k x=2kлy=2k-2x kΪ

x[0,)ʱ, arccos(cosx)=x x[,2) 0x-У cos(x-)=-cosx arccos(cosx)=arccos[-cos(x-)]=-arccos{cos(x-)}=2-x Եx[0,2)ʱ arccos(cosx)=-|-x| F(X)=acrcos(cosx) F(x+2)=acrcoscos(x+2)]=acrcos(cosx)=F(X) ԭ...

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