化简:[sin(2π-α)cos(π+α)cos(π/2 +α)cos(11π/2 -α)]/[c
化简:[sin(2π-α)cos(π+α)cos(π/2+α)cos(11π/2-α)]/[cos(π-α)sin(3π-α)sin(-π-α)sin(9π/2+α)]...
化简:[sin(2π-α)cos(π+α)cos(π/2 +α)cos(11π/2 -α)]/[cos(π-α)sin(3π-α)sin(-π-α)sin(9π/2 +α)]
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