He had many tricks in limited area. All his his tricks were limited to classical calculus and nineteenth-century mathematics. He didn't do anything fancy.
His style was always the same, he just mastered it really well.
That is the actual trick. To master one trick so well that you can spot anywhere its hiding. Unfortunately, this takes a long time, which is why most mathematicians can only do it for a couple of tricks in their lifetime
His style was always the same, he just mastered it really well.