On trigonometric proofs of the Steiner-Lehmus theorem - Robert Olah-Gal and Jozsef Sandor

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    On trigonometric proofs of the Steiner-Lehmus theorem - Robert Olah-Gal and Jozsef Sandor​

    We offer a survey of some lesser known or new trigonometric proofs of the Steiner-Lehmus theorem. A new proof of a recent refined variant is also given.

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    LTTK CTV, 9/10/19
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