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