shuāngqūzhèngxián
ㄕㄨㄤ ㄑㄩ ㄓㄥˋ ㄒㄧㄢˊ
Simplified 双曲正弦
Taivo → Settings → Partner inbox → Make the link. It stays in this browser.
Keep 雙曲正弦 and it comes back until you know it.