HP Prime Graphing Wireless Calculator - Manual (Page 130)

126 Functions and commands
asinx → atanx Returns an expression with asin(x) rewritten as:
asin2atan(Expr)
Example:
asin2atan(2*asin(x))
returns
sinx → cosx*tanx Returns an expression with sin(x) rewritten as cos(x)*tan(x).
sin2costan(Expr)
Example:
sin2costan(sin(x))
gives
tan(x)*cos(x)
Cosine
acosx → asinx Returns an expression with acos(x) rewritten as π/2–asin(x).
acos2asin(Expr)
Example:
acos2asin(acos(x)+asin(x))
returns π
/2
acosx → atanx Returns an expression with acos(x) rewritten as:
acos2atan(Expr)
Example:
acos2atan(2*acos(x))
gives
cosx → sinx/tanx Returns an expression with cos(x) rewritten as sin(x)/tan(x).
cos2sintan(Expr)
Example:
cos2sintan(cos(x))
gives
sin(x)/tan(x)
x
1 x
2
–
--------------------
 
 
 
atan
2
x
1 x
2
–
--------------------
 
 
 
atan ⋅
π
2
---
x
1 x
2
–
--------------------
 
 
 
atan –
2 π
2
---
x
1 x
2
–
--------------------
 
 
 
atan –
 
 
 
⋅