Mathematics
Senior High
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90°＜θ＜180°とし、sinθ＋cosθ＝－1/2, sinθcosθ＝－3/8, sinθ－cosθ＝√7/2がわかっている時、tanθ－1/tanθはどうやって求めればいいですか？教えてください！
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