3π/4
已知3π/4<α<π,tanα+1/tanα=-10/3
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已知3π/4<α<π,tanα+1/tanα=-10/3.求tanα的值
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化简:[ tan(π/4+α) - tan(π/4-α) ] / tan2α - tan(π/4+α)tan(π/4-α
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