已知sin(α-3π)+cos(π/2+α)=m,求证cos(α-7π/2)+2sin(2kπ-α)=3m/2

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已知sin(α-3π)+cos(π/2+α)=m,求证cos(α-7π/2)+2sin(2kπ-α)=3m/2
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已知sin(α-3π)+cos(π/2+α)=m,求证cos(α-7π/2)+2sin(2kπ-α)=3m/2
已知sin(α-3π)+cos(π/2+α)=m,求证cos(α-7π/2)+2sin(2kπ-α)=3m/2

已知sin(α-3π)+cos(π/2+α)=m,求证cos(α-7π/2)+2sin(2kπ-α)=3m/2
sin(α-3π)+cos(π/2+α)=-sinα-sinα
cos(α-7π/2)+2sin(2kπ-α)=-sinα-2sinα