已知sina=根号5/5,则sin^4-cos^4a得值?
已知sina=根号5/5,则sin^4-cos^4a得值?
已知sina=根号5/5,则sin^4 a-cos^4 a [急!]
已知sina=根号5/5,则sin^4a-cos^4a的值为_____,
已知cos(a-派/6)+sina=4/5根号3,则sin(a+7/6派)的值是?
已知cos(a-π/6)+sina=(4*根号3)/5,则sin(a+7π/6)的值是( )
已知cos(a+兀/6)-sina=4/5根号3,则sin(a-兀/6)=
已知cos(a-π/6)+sina=4根号下3/5,则sin(a+7π/6)=?
sin(a+π/3)+sina= - 4根号3/5,则cos(a+2π/3)
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cos(a-π/6)+sina=(4*根号3)/5,则sin(a+7π/6)的值是( )
已知cos(a-π/6)+sina=(4*根号3)/5,则sin(a-7π/6)的值是