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A better abbreviation for sine & cosine

For some weird reason the abbreviation for sine is sin and cos for cosine. This is madness compared to the beautiful and logical abbreviation for tangent and cotangent: tg and ctg respectively.

My proposal:

sine si
cosine csi
tangent tg
cotangent ctg

Quite obviously, I submitted them to my local ISO representative for review.

2018   abbreviations   maths   naming