tan+2阿尔法等于负十三分之一cos阿尔法怎么求
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tan2a = 2tana/[1-(tana)^2] = -1/13
26tana = (tana)^2 - 1
(tana)^2 - 26tana - 1 = 0
tana = 13±√170,
tana = 13+√170, seca = √[340+26√170]
cosa = √[340-26√170]/680
tana = 13-√170, seca = √[340-26√170]
cosa = √[340+26√170]/680
26tana = (tana)^2 - 1
(tana)^2 - 26tana - 1 = 0
tana = 13±√170,
tana = 13+√170, seca = √[340+26√170]
cosa = √[340-26√170]/680
tana = 13-√170, seca = √[340-26√170]
cosa = √[340+26√170]/680
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