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[Merged by Bors] - feat(Trigonometric): add lemmas about cos x = -1 ↔ _ etc#9878
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urkud wants to merge 1 commit intomasterleanprover-community/mathlib4:masterfrom YK-sincos-eq-oneleanprover-community/mathlib4:YK-sincos-eq-oneCopy head branch name to clipboard