化简sin(-α-5π)*cos(α-π/2)-tan(α-3π/2)*tan(2π-α)

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1.求证tanαsinα/tanα-sinα=tanα+sinα/tanαsinα2.已知sinα+cosα=-1/5(π/2

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已知3sinα+5cosα=5,求3cosα-5sinα第二题 化简 根号[1-2tan(-37π/6)+tan²(-43π/6)]第三题 已知 [1-tan(π-α)]/[1-tan(π+α)=3+2根号2 求cos²(π-α)+sin(π+α)cos(π-α)+2sin²(α-π)

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