化简cos^4(a/2)-sin^4(a/2)=
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化简cos^4(a/2)-sin^4(a/2)=
化简cos^4(a/2)-sin^4(a/2)=
化简cos^4(a/2)-sin^4(a/2)=
cos^4(a/2)-sin^4(a/2)= cos^2(a/2)-sin^2(a/2)=cosa
化简:sin^4a+cos^2a-sin^2a-cos^4a
化简 1-sin^4a-cos^4a/cos^2a-cos^4a
化简(1-sin^6 a-cos^6 a)/(cos^2 a-cos^4 a)==
sin^4+sin^2cos^2+cos^2a=
(1-sin^4a-cos^4)/(sin^2a-sin^4a) 化简
cos^4A-sin^4a 化简
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4sin(a/4)cos(a/4)cos(a/2)cosacos2a化简,a是某角.
化简cos^4(a/2)-sin^4(a/2)=
化简cos^4(a/2)-sin^4(a/2)
Sin^4a+Sina*Cosa+Cos^2a化简
化简1-sin^4a-cos^4a/1-sin^6a-cos^6a
1-sin^6a-cos^6a分之1-sin^4a-cos^4a 化简
sin^4a-cos^4a=sin^2a-cos^2a
证明sin^4a-cos^4a=sin^2a-cos^2a
用 cos a表示 sin^4 a-sin^2 a+cos^2 a
tan a =3求4sin a-2cos a/5cos+3sin a
化简 sin^4a-cos^4b