已知sinθ,cosθ是方程4x
2-4mx+2m-1=0的两个根,
<θ<2π,求角θ.
人气:148 ℃ 时间:2019-08-20 13:42:11
解答
∵sinθ+cosθ=m , sinθcosθ=2m−14,且m2-2m+1≥0代入(sinθ+cosθ)2=1+2sinθ•cosθ,得m=1±32,又3π2<θ<2π,∴sinθ•cosθ=2m−14<0,sinθ+cosθ=m=1−32,∴sinθ=...
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