The input 6÷2(2+1)
will produce 2 results depending on your choice:
6 ÷ 2(2+1) = 9
Open the setting screen, then select 1/2Pi=1/2*Pi
option
Calculation of 6÷2(2+1)
produces result 9
6 ÷ 2(2+1) = 1
Open the setting screen, then select 1/2Pi=1/(2*Pi)
option
Calculation of 6÷2(2+1)
produces result 1