已知cosa=1/4,则sin^4a+cos^4a
已知cosa=1/4,求sin(2π+a)cos(-π+a)/cos(-a)tana
已知sina-cosa=根号2/2,则sin^4a+cos^4a=
已知sina+cosa=根号2/2,则sin^4a+cos^4a
已知sina+cosa=1/3,求sin^a+cos^4a
1:已知sina+cosa=根2求sina cosa sin(4方)a+cos(4方)的值
已知sinA-cosA=1/2,求sin*4A+cos*4A,sin*3A-cos*3A的值
sin(a-B)cosa-1/2[sin(2a+B)-sinB]=?已知cos(a-π/6)+sina=4√3/5则si
已知cos^2A+cosA=1,则sin^6A+sin^2A=?
sin^4a+cos^4a=1,则sina-cosa=
若sin^4a+cos^4a=1,则sina+cosa=
已知sina+cosa=根号2,求sinacosa,tana,sin^4a+cos^4a
已知tan=-4,求sin方a,3sinacosa,cos方a-sin方a,4sina-2cosa/5cosa+3sin