The phrase "are actively cooperating" is correct and usable in written English.
It can be used to describe a situation where individuals or groups are working together in a collaborative manner.
Example: "The two departments are actively cooperating to ensure the success of the project."
Alternatives: "are working together" or "are collaborating effectively".
Clinton's lawyer David Kendall said in a statement: "We are actively cooperating".
We are actively cooperating with the FBI and other authorities in relation to the investigation on the suspect".
We are actively cooperating with the content community and other rights holders in their efforts to combat piracy".
We are actively cooperating with international law enforcement in an effort to bring those responsible for the theft of proprietary member and business information to justice.
Although some Chinese wildlife officials are actively cooperating with international groups, the top levels of China's government give only lip service to the elephant ivory problem.
We should make no mistake that big tech companies are actively cooperating with the NSA and other government agencies that want to spy on us.
The Home Office argued that the men had not done enough to show that they were actively cooperating with attempts to obtain new travel documents, but campaigners say that several countries including Algeria and Iran are "systematically unwilling" to recognise detainees as citizens.
"It is not right that the UK should be actively cooperating with a justice system that shows such flagrant disregard for the most basic human rights and the rule of law," Slaughter argued.
As evidence that Mr. Arafat is capable of turning terror on and off, a senior Israeli security official noted that between October 1998 and October 2000, a period when the Palestinian Authority was actively cooperating in controlling militant organizations, there were only three attempted terror attacks.
We're actively cooperating with the NTSB in their investigation.
Berkshire Hathaway doesn't foresee any restatement of its financials, and has been "actively cooperating" with a regulatory probe.
