Translation of "Investigated" in Spanish

Researchers have investigated this,

Se ha investigado al respecto

I investigated new ideas,

Investigué nuevas ideas

It's based on another trick I investigated,

Está basado en otro truco que investigué,

He has investigated the possibility of cooperation.

Él ha investigado la posibilidad de una cooperación.

The police carefully investigated the cause of the accident.

La policía investigó cuidadosamente la causa del accidente.

He investigated in the hope of finding some useful general features.

El investigó con la esperanza de encontrar algunas características generales útiles.

- He has investigated the possibility of cooperation.
- He has studied the possibility of a collaboration.

Él ha estudiado la posibilidad de una colaboración.

- Nothing is so difficult that it cannot be studiously investigated.
- Nothing is so difficult that it cannot be studied.

Nada es tan difícil que no se pueda estudiar.