in that =because
in which =that
除了这两个以外好像还有其他的几个介词+关系代词等于另外一个词，请学长全部写出来，还有就是这些问什么相等啊，还加一些详细的列子让我参考一些吧。
thank you for yours

1）in that =because,注意，that后跟名词性从句，看下面例句：
This book is different from that book in that this one is about chemistry and that one about history.
这本书不同于那本,因为这本是有关化学的,而那本是有关历史的。
2） in which =that ，
Bejing is a big city.I was born in Bejing.
Being is a big city in which I was born.
3）上述所谓的等式，并不完全正确。in that 准确意思是“在于或在--方面”，in which =where。学习语言，千万不可机械理解所谓的“等于”。