1) Общая лексика: каковой, какой (I don't know which way we must take - я не знаю, по какой дороге нам надо ехать), который (which of you am I to thank? - кого из вас мне благодарить?), кто (подразумевается выбор), любой, тот, что (The ESD transistors are designed to be much sturdier than the transistors they protect, which is possible because they do not have to meet the same high-performance standards as the active transistors.), что (We had officially limited Dr. von Braun to a 200-mile range, which may have made many feel his rocket was a weakling.), что (We know this already, which is the reason people in hot countries wear white hats against the Sun.), что (the book which you are talking about... - книга, о которой вы говорите...)
2) Математика: каков
Универсальный англо-русский словарь. Академик.ру. 2011.