求证:(tan(π/5))^2+(tan(2π/5))^2=2tan(π/5)tan(2π/5)上面的问题打错,这个才对求证:(tan(π/5))^2+(tan(2π/5))^2=2(tan(π/5)tan(2π/5))^2对不起,已修改
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求证:(tan(π/5))^2+(tan(2π/5))^2=2tan(π/5)tan(2π/5)上面的问题打错,这个才对求证:(tan(π/5))^2+(tan(2π/5))^2=2(tan(π/5)tan(2π/5))^2对不起,已修改
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