高一数学求解要过程
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(1)
tan(θ+π/4)
=(tanθ+tanπ/4)/(1-tanθtanπ/4)
=(tanθ+1)/(1-tanθ·1)
=(tanθ+1)/(1-tanθ)
=(-3+1)/[1-(-3)]
=-1/2
(2)
(sinθ+cosθ)/(sinθ-2cosθ)
=(tanθ+1)/(tanθ-2)
=(-3+1)/(-3-2)
=2/5
tan(θ+π/4)
=(tanθ+tanπ/4)/(1-tanθtanπ/4)
=(tanθ+1)/(1-tanθ·1)
=(tanθ+1)/(1-tanθ)
=(-3+1)/[1-(-3)]
=-1/2
(2)
(sinθ+cosθ)/(sinθ-2cosθ)
=(tanθ+1)/(tanθ-2)
=(-3+1)/(-3-2)
=2/5
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