作业帮求证:[(tana+sina*tana)/(tana+sina)]*[(1+seca)/(1+csca)]=tana
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![求证:[(tana+sina*tana)/(tana+sina)]*[(1+seca)/(1+csca)]=tana](/uploads/image/z/8566700-68-0.jpg?t=%E6%B1%82%E8%AF%81%3A%5B%28tana%2Bsina%2Atana%29%2F%28tana%2Bsina%29%5D%2A%5B%281%2Bseca%29%2F%281%2Bcsca%29%5D%3Dtana)
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求证:[(tana+sina*tana)/(tana+sina)]*[(1+seca)/(1+csca)]=tana
求证:[(tana+sina*tana)/(tana+sina)]*[(1+seca)/(1+csca)]=tana
求证:[(tana+sina*tana)/(tana+sina)]*[(1+seca)/(1+csca)]=tana
把tanα变成sina除以cosa,把1变成sin平方加cos平方就能做了吧