化简sin(-α-5π)cos(α-π/2)-tan(α-3π/2)*tan(2π-α)
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化简sin(-α-5π)cos(α-π/2)-tan(α-3π/2)*tan(2π-α)
化简sin(-α-5π)cos(α-π/2)-tan(α-3π/2)*tan(2π-α)
化简sin(-α-5π)cos(α-π/2)-tan(α-3π/2)*tan(2π-α)
sin(-α-5π)cos(α-π/2)-tan(α-3π/2)*tan(2π-α)
=-sinα*sinα-(1/tanα)*tanα
=1-(sinα)^2=(cosα)^2
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