求证:tana+cosa/(1+sina)=1/cosa
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求证:tana+cosa/(1+sina)=1/cosa
求证:tana+cosa/(1+sina)=1/cosa
求证:tana+cosa/(1+sina)=1/cosa
三角函数啊```
(sinA/cosA)+(cosA/1+sinA)
通分→sinA+sin^2A+cos^2A/cosA(1+sinA)
→sinA+1/cosA(1+sinA)
→1/cosA