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t=√2sin(x+π/4)より、

√2=√2sin(x+π/4)
→ sin(x+π/4)=1
→ x+π/4=π/2
→ x=π/4

-√2=√2sin(x+π/4)
→ sin(x+π/4)=-1
→ x+π/4=3π/2
→ x=5π/4

のん

ありがとうございます😭助かりました🙇‍♀️

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