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The phrase "are too difficult to" is correct and usable in written English.
It can be used when expressing that something is excessively challenging or hard to accomplish.
Example: "These math problems are too difficult to solve without additional help."
Alternatives: "are overly challenging to" or "are excessively hard to".
Exact(60)
The main roles are too difficult to cast satisfactorily.
The complexities involved in making schedules are too difficult to suit everyone," Leo said.
Victories are too difficult to achieve to be left on the table.
The Times was more direct: They are too difficult to prosecute but too dangerous to release.
It is as if the facts are too difficult to contemplate.
But just as often, they have business models that are too difficult to change.
However, with incremental 'patches' on the Internet, the current network architecture faces many problems which are too difficult to solve.
When economics departments hire new PhDs, their preferences are too difficult to codify in a matching system.
Not many people use them to record programmes off the air, because they are too difficult to operate.
The species mass fraction profiles and the temperature distribution, which are too difficult to measure due to the tiny dimension of the microchannel in experiments, are captured.
Soft computing techniques that have recently emerged can be used to model the solution of real-world problems that are too difficult to model mathematically.
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Since I tried Ludwig back in 2017, I have been constantly using it in both editing and translation. Ever since, I suggest it to my translators at ProSciEditing.

Justyna Jupowicz-Kozak
CEO of Professional Science Editing for Scientists @ prosciediting.com