Why stop at greek or arabic when you can go all the way to sanskrit?

The words for sine and cosine derive from the sanskrit jiva (meaning bowstring, i.e., the chord of a circle)[1]. Sine and cosine were respectively jya and koti-jya, which got transcribed into arabic without the vowel (where it meant nothing). They then pronounced the vowel in the wrong place, calling it jeb (which meant pocket or fold in arabic)[2]. Then this wrong word got translated into latin as sinus (fold), and hence we have sine and cosine!

1. https://en.m.wikipedia.org/wiki/Jy%C4%81,_koti-jy%C4%81_and_...

2. https://en.m.wikipedia.org/wiki/Sine_and_cosine#Etymology