HP NW280-200X User Manual page 311

Cosine
acosx → asinx
acosx → atanx
cosx → sinx/tanx
Tangent
atanx → asinx
atanx → acosx
tanx → sinx/cosx
halftan
Trig
trigx → sinx
trigx → cosx
trigx → tanx
Functions and commands
Returns an expression with arccos(x) rewritten as pi/2-
arcsin(x).
acos2asin(Expr)
Returns an expression with arccos(x) rewritten as pi/2-
arctan(x/sqrt(1-x^2)).
acos2atan(Expr)
Returns an expression with cos(x) rewritten as sin(x)/tan(x).
cos2sintan(Expr)
Returns an expression with arctan(x) rewritten as arcsin(x/
sqrt(1+x^2)).
atan2asin(Expr)
Returns an expression with arctan(x) rewritten as pi/2-
arccos(x/sqrt(1+x^2)).
atan2acos(Expr)
Returns an expression with tan(x) rewritten as sin(x)/cos(x).
tan2sincos(Expr)
Returns an expression with sin(x), cos(x) or tan(x) rewritten as
tan(x/2).
halftan(Expr)
Returns an expression simplified using the formulas
sin(x)^2+cos(x)^2=1 and tan(x)=sin(x)/cos(x) (privileging
sine).
trigsin(Expr)
Returns an expression simplified using the formulas
sin(x)^2+cos(x)^2=1 and tan(x)=sin(x)/cos(x) (privileging
cosine).
trigcos(Expr)
Returns an expression simplified using the formulas
sin(x)^2+cos(x)^2=1 and tan(x)=sin(x)/cos(x) (privileging
tangent).
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