已知sina=根号5/5,则sin^4-cos^4a得值?
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已知sina=根号5/5,则sin^4 a-cos^4 a [急!]
已知sina=根号5/5,则sin^4-cos^4a得值?
已知sin(a+π/3)+sina=-(4倍根号下3)/5,-π/2
已知sin(a+π/3)+sina=-4根号3/5,-π/2
已知sin(a+pie/3)+sina=-4根号3/5,-pie/2
已知sin(a+π/3)+sina=-4根号3/5 -π/2
已知sina=根号5/5,则sin^4a-cos^4a的值为_____,
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已知cos(a-π/6)+sina=4根号下3/5,则sin(a+7π/6)=?
已知cos(a-π/6)+sina=(4*根号3)/5,则sin(a+7π/6)的值是( )
已知sina=5分之根号5,则cosa+sina分之cosa-sina+cosa-sina分之cosa+sina=
已知sina=根号5/5,则sin四次方a-cons四次方a是值为
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sin(a+派/3)+sina=-(4根号3)/5,-派/2
已知sin(a+派/3)+sina=-(4根号3)/5,-派/2
(T=派)1.已知a属于[5T/2,7T/2],则根号下(1+sina)+根号下(1-sina)2.若1/cosa-1/sina=1 则 sin(2a)=
已知cotβ=根号5,sina/sinβ=sin(a+β),求cot(a+β).