已知sin(π/2+α)-cos(3π/2-α)=1/5(π/2
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![已知sin(π/2+α)-cos(3π/2-α)=1/5(π/2](/uploads/image/z/2758450-58-0.jpg?t=%E5%B7%B2%E7%9F%A5sin%28%CF%80%2F2%2B%CE%B1%29-cos%283%CF%80%2F2-%CE%B1%29%3D1%2F5%28%CF%80%2F2)
已知sin(π/2+α)-cos(3π/2-α)=1/5(π/2 已知sin(π/2+α)-cos(3π/2-α)=1/5(π/2
已知sin(π/2+α)-cos(3π/2-α)=1/5(π/2
==》cosa+sina=1/5
cos^a+2cosasina+sin^a=1+2cosasina=1/25
cosasina=-12/25
cosa<0,-sina<0 1-2cosasina=(cosa-sina)^=49/25
cosa-sina=-7/25
tana=sina/cosa=-12/2=-6