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一題三角函數問題 送20點喔
sin(90-Y)=1.33*sinYX+Y=90求X跟Y
sin(90-Y)=1.33*sinY → cosY=1.33*sinY → cosY/sinY=1.33 →??cotY=1.33 → tanY=1/1.33=0.7519Y=tan-10.7519≒37度X=90-Y≒53度 2006-11-06 10:59:58 補充: 三角函數表,請參考:http://tw.knowledge.yahoo.com/question/?qid=1305091716169
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