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sinθ,cosθ是關於x的方程4x*+5x+k=0的兩個根是sinθ+cosθ=-5/4平方一下得sin^2θ+2sinθcosθ+cos^2θ=25/161+2sinθcosθ=25/162sinθcosθ=25/16-1=9/16sinθcosθ=9/32因為sinθcosθ=k/4所以k/4=9/32k=9/8…
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