化简:[ cos(α-π/2)/sin(5π/2+α) ] ×sin(α-2π) × cos(2π-α)RT.

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化简:[cos(α-π/2)/sin(5π/2+α)]×sin(α-2π)×cos(2π-α)RT.化简:[cos(α-π/2)/sin(5π/2+α)]×sin(α-2π)×cos(2π-α)RT.

化简:[ cos(α-π/2)/sin(5π/2+α) ] ×sin(α-2π) × cos(2π-α)RT.
化简:[ cos(α-π/2)/sin(5π/2+α) ] ×sin(α-2π) × cos(2π-α)
RT.

化简:[ cos(α-π/2)/sin(5π/2+α) ] ×sin(α-2π) × cos(2π-α)RT.
原式=sinα/cosα *sinα*cosα
=sin^2α