(3-4cos 2A+cos 4A)/(3+4cos 2A+cos 4A)化简,跪求
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化简(1-sin^6 a-cos^6 a)/(cos^2 a-cos^4 a)==
已知(4sin a-2cos a)/(5cos a +3sin a)=6/11,求cos^4 a-sin^4 a
已知sin a-2cos a=0 求4sin^2 a-3sin a x cos a-5cos^2 a的值
已知tan a=-1/3,求4sin a-2cos a/5cos a+3sin a=
已知tan a=2,求:(4*sin a-2*cos a)/(5*sin a+3*cos a)的值
证明sin(4A)sin(2A)(1-cos(2A)) cos(4A)cos(2A)(1 cos(2A))=cos(2A
化简 cot(a+4π)cos(a+π)[sin(a+3π)]^2/tan(π+a)[cos(-π-a)]^2
急::已知sin(3π+a)=2cos(a-4π),求(5sin(π/2+a)+cos(π/2-a))/(2cos(π+
已知角a的终边过点p(-4,3).求cos(TT/2+a)-sin(TT-a)/cos(a-7TT)+cos(9TT/2
若sina+sin^2a=1,求cos^2a+cos^4a的和
已知cosa=1/4,求sin(2π+a)cos(-π+a)/cos(-a)tana