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1+2sinαcosα=1/3sinαcosα=-1/3 sinα+cosα=1/3(sinα-cosα)^=1-2sinαcosα=5/3sinα-cosα=√15/3或-√15/3α∈(0,π)sinα=(1+√15)/6或(1-√15)/6(負數舍去)cosα=(1-√15)/6tanα=(1+√15)/(1…
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