已知0<β<π/4<α<3π/4,cos(π/4-α)=3/5,sina(3π/4 β)=5/13,

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已知0<β<π/4<α<3π/4,cos(π/4-α)=3/5,sina(3π/4+β)=5/13,求sina(α+β)的值

已知0<β<π/4<α<3π/4,cos(π/4-α)=3/5,sina(3π/4+β)=5/13,求sina(α+β)的值已知0<β<π/4<α<3π/4,cos(π/4-α)=3/5,sina(3

已知0<β<π/4<α<3π/4,cos(π/4-α)=3/5,sina(3π/4+β)=5/13,求sina(α+β)的值

已知0<β<π/4<α<3π/4,cos(π/4-α)=3/5,sina(3π/4+β)=5/13,求sina(α+β)的值已知0<β<π/4<α<3π/4,cos(π/4-α)=3/5,sina(3

已知0<β<π/4<α<3π/4,cos(π/4+α)=3/5,sina(3π/4+β)=5/13,求sina(2α+2β)的值

已知0<β<π/4<α<3π/4,cos(π/4+α)=3/5,sina(3π/4+β)=5/13,求sina(2α+2β)的值已知0<β<π/4<α<3π/4,cos(π/4+α)=3/5,sina

已知0<β<π/4<α<3π/4,cos(π/4+α)=3/5,sina(3π/4+β)=5/13,求sina(2α+2β)的值已知0<β<π/4<α<3π/4,cos(π/4-α)=3/5,sina(3π/4+β)=5/13,求sina(α+β)的值

已知0<β<π/4<α<3π/4,cos(π/4+α)=3/5,sina(3π/4+β)=5/13,求sina(2α+2β)的值已知0<β<π/4<α<3π/4,cos(π/4-α)=3/5,sina

已知0<β<π/4<α<3π/4,cos(π/4-α)=3/5,sina(3π/4+β)=5/13,求cos(α-β﹚帮帮忙啊!

已知0<β<π/4<α<3π/4,cos(π/4-α)=3/5,sina(3π/4+β)=5/13,求cos(α-β﹚帮帮忙啊!已知0<β<π/4<α<3π/4,cos(π/4-α)=3/5,sina

已知π/4已知sina=4根号3/7,cos(a-β),且0

已知π/4已知sina=4根号3/7,cos(a-β),且0已知π/4已知sina=4根号3/7,cos(a-β),且0已知π/4已知sina=4根号3/7,cos(a-β),且0∵π/4

已知cos(a-π/6)=4/5 (π/6<a<2π/3)求sina的值

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①已知Sina+COSa/Sina-COSa=3,求Sina,COSa的值;②已知π/2<b<a<3π/4,COS(a-b)=12/13②已知π/2小于b<a<3π/4,COS(a-b)=12/13,sin(a+b)=-3/5,求COS2b的值.

①已知Sina+COSa/Sina-COSa=3,求Sina,COSa的值;②已知π/2<b<a<3π/4,COS(a-b)=12/13②已知π/2小于b<a<3π/4,COS(a-b)=12/13,

已知2sina/2·cos(π/2-a/2)=3/4,求sina

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已知向量a=(cosa,sina),向量b=(cosβ,sinβ),若-π/4<a<π/4,β=π/4,且且a点乘b=3/5,求sina

已知向量a=(cosa,sina),向量b=(cosβ,sinβ),若-π/4<a<π/4,β=π/4,且且a点乘b=3/5,求sina已知向量a=(cosa,sina),向量b=(cosβ,sinβ

已知sina =3/5 a∈(π/2,π) 求cos(π/4-a)

已知sina=3/5a∈(π/2,π)求cos(π/4-a)已知sina=3/5a∈(π/2,π)求cos(π/4-a)已知sina=3/5a∈(π/2,π)求cos(π/4-a)cosa=-4/5c

已知sina=2/3,cosβ=-3/4,α∈(π/2,π),β∈(π,3π/2),求cos(α-β)的值

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已知a为锐角,且cos(a+π/4)=-3/5,求sina

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已知0<α<π,sin(α+π/4)=12/13,求sina/cos(π/4-α)的值已知0<α<π,sin(α+π/4)=12/13,求sina/cos(π/4-α)的值已知0<α<π,sin(α+

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已知cos(a-π/6)+sina=4√3/5,则sin(a+7π/6)=?已知cos(a-π/6)+sina=4√3/5,则sin(a+7π/6)=?已知cos(a-π/6)+sina=4√3/5,