HP 49G User Manual page 9

arc cos
ACOS2S(ACOS(2/3)+ACOS(X))
π/2-ASIN(2/3)+π/2-ASIN(X)
ADDTMOD
ADDTMOD(X^2+3*X+6,9*X+3)
X^2-2*X+2
Command Reference: Part A (1.1)
 
2
x ( )
-- -
+ arc cos
 
3
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