sinα+cosα=(根號3+1)/2 sinαcosα=m/2
sinα/(1-cotα)+cosα/(1-tanα)
= sinαsinα/( sinα-cosα)+cosαcosα/(cosα-sinα)
=(sinαsinα-cosαcosα)/( sinα-cosα)
=sinα+cosα
=(根號3+1)/2
2x^2-(根號3+1)x+m=0的兩根為sinα,cosα,求sinα/(1-cotα)+cosα/(1-tanα)
2x^2-(根號3+1)x+m=0的兩根為sinα,cosα,求sinα/(1-cotα)+cosα/(1-tanα)
數(shù)學(xué)人氣:522 ℃時間:2020-03-15 02:18:13
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