sinα/2-cosα/2=-根號5/5
兩邊平方得:
1-2sinα/2cosα/2=1/5
1-sinα=1/5
sinα=4/5
已知sinα/2-cosα/2=-根號5/5 450°
已知sinα/2-cosα/2=-根號5/5 450°
數(shù)學(xué)人氣:865 ℃時間:2020-06-12 15:03:59
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