The phrase "a particularly challenging task" is correct and usable in written English.
You can use it when describing a task that is notably difficult or demanding in some way.
Example: "Completing the project on time proved to be a particularly challenging task for the team."
Alternatives: "an especially difficult task" or "a notably tough task".
Given the city's recent history, this is a particularly challenging task.
Admirers of Waters's first novel will recognize her consummate skill in evoking a sense of place -- a particularly challenging task in the first half of "Affinity," in which Margaret sets out to write a factual catalog of her visits.
Due to imperfections in low-cost hardware nodes and the decentralized nature of wireless sensor networks, global time synchronization has been recognized as a particularly challenging task.
The discrimination between DFS and the so-called 'quasi-homogeneous pattern' might be a particularly challenging task for routine diagnostic laboratories [2], and inaccurate interpretation may have significant consequences.
Modeling of strip DE membranes clamped at both ends, having a nearly unitary aspect ratio (i.e., the ratio between the membrane length and width), turns out to be a particularly challenging task.
Navigation on unmarked and possible poorly delineated roads where the boundaries between the road and the non-road surfaces are not clearly indicated is a particularly challenging task for autonomous vehicles.
One particularly challenging task is to explain the shifts in diversification rates that have produced differences in species diversity spanning several orders of magnitude between sister lineages [3].
We were somewhat surprised by the ability of the sheep to perform the attentional set shifting task, since it is a particularly challenging test of cognitive function.
At first glance, this may be surprising, but when looking at the coefficients found from solving the Yule-Walker equations, see Fig. 9, it is evident that low mobility presents a particularly challenging tracking task for a third-order AR model, due to large dynamics.
