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The best answer to the urgent need for a first-year math course is thank you!
l？ ∨l？

As shown in the figure,

∵∠ 1=∠2

∠∠ 2 =∠∠∠ 3 (equal to the vertex angle)

∴∠ 1=∠3 (equivalent substitution) ∴l? ∨l？ (Same angle is equal, two straight lines are parallel)

I hope I can help you!

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