User`s manual

7-5
SQR
(x)
Returns the square root of the argument. SQR(X) is the same as X
↑
(1/2), only
faster.
100 Y=SQR(X↑
↑↑
↑2-H↑
↑↑
↑2)
TAN
(x)
Returns the tangent of the argument (argument must be in radians). To
obtain the tangent of X when X is in degrees, use TAN(X*.01745329).
100 Z=TAN(2*A)
NOTE:
A great many other functions may be created using the above
functions. See Appendix F, "Derived Functions".