Casio fx-991CW+ UK for Further Maths
Consult the manual for this exact UK model. Do not assume every screen or menu matches the original CW.
Non-calculator papers prohibit use even where the calculator can solve the problem.
Before accepting an answer
Check angle mode, domain and the form requested. A decimal approximation does not replace an exact result, and a list of numerical roots does not show why every required root has been found.
For matrix work, confirm dimensions and multiplication order. For a probability, choose the tail and interpret it in context before deciding what the result means.
Use the linked manufacturer instructions for the exact screen and software version. Menu names differ between models.