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sinα-cosα=1/5sin²;α+cos²;α=1,又因為0≤α≤π聯立解得sinα=4/5,cosα=3/5tanα=sinα/cosα=4/3親,其實這裡介紹一個秒殺做法,1/5,做題多了很容易聯想到直角三角形3,4,5三邊,那麼4/5-3/5恰好為1/ 5,而…
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