sin(2x-π/2)变成cos为多少

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sin(2x-π/2)变成cos为多少sin(2x-π/2)变成cos为多少sin(2x-π/2)变成cos为多少sin(2x-π/2)=sin(2x)cos(π/2)-cos(2x)sin(π/2)

sin(2x-π/2)变成cos为多少
sin(2x-π/2)变成cos为多少

sin(2x-π/2)变成cos为多少
sin(2x-π/2)
=sin(2x)cos(π/2)-cos(2x)sin(π/2)
=sin(2x)0-cos(2x)1
=-cos(2x)