tan(@+派\8)=2,求tan(@-派\8)
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![tan(@+派\8)=2,求tan(@-派\8)](/uploads/image/z/171325-37-5.jpg?t=tan%28%40%2B%E6%B4%BE%5C8%EF%BC%89%3D2%2C%E6%B1%82tan%28%40-%E6%B4%BE%5C8%29)
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tan(@+派\8)=2,求tan(@-派\8)
tan(@+派\8)=2,求tan(@-派\8)
tan(@+派\8)=2,求tan(@-派\8)
tan(θ-π/8)
=tan[(θ+π/8)-(π/4)]
=[tan(θ+π/8)-tan(π/4)]/[1+tan(θ+π/8)tan(π/4)]
=[tan(θ+π/8)-1]/[1+tan(θ+π/8)]
=[2-1]/[1+2]
=1/3
则:tan(θ-π/8)=1/3