若α是锐角,且cos(α+π/4)=-1/3,则sinα=

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若α是锐角,且cos(α+π/4)=-1/3,则sinα=若α是锐角,且cos(α+π/4)=-1/3,则sinα=若α是锐角,且cos(α+π/4)=-1/3,则sinα=设x=α+π/4则cosx

若α是锐角,且cos(α+π/4)=-1/3,则sinα=
若α是锐角,且cos(α+π/4)=-1/3,则sinα=

若α是锐角,且cos(α+π/4)=-1/3,则sinα=
设x=α+π/4
则cosx=-1/3
显然π/4