HP 40gs - Manual (Page 226)

14-44 Computer Algebra System (CAS)
Typing:
TRIG(SIN(X) 2 + COS(X) 2 + 1)
gives:
2
TRIGCOS Simplify using the cosines
TRIGCOS has as an argument a trigonometric
expression.
TRIGCOS simplifies this expression, using the identity
sin(x)
2
+cos(x)
2
= 1 to rewrite it in terms of cosines.
Typing:
TRIGCOS(SIN(X) 4 + COS(X) 2 + 1)
gives:
TRIGSIN Simplify using the sines
TRIGSIN has as an argument a trigonometric expression.
TRIGSIN simplifies this expression, using the identity
sin(x)
2
+ cos(x)
2
= 1 to rewrite it in terms of sines.
Typing:
TRIGSIN(SIN(X) 4 + COS(X) 2 + 1)
gives:
TRIGTAN Simplify using the tangents
TRIGTAN has as an argument a trigonometric expression.
TRIGTAN simplifies this expression, using the identity
sin(x)
2 + cos(x) 2 = 1 to rewrite it in terms of tangents.
Typing:
TRIGTAN(SIN(X) 4 + COS(X) 2 + 1)
gives:
x ( )
4
cos x ( )
2
cos 2 + –
x ( ) 4
sin x ( ) 2
sin 2 + –
2 x ( )
4
tan ⋅ 3 x ( )
2
tan ⋅ 2 + +
x ( )
4
tan 2 + x ( )
2
tan 1 + ⋅
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hp40g+.book Page 44 Friday, December 9, 2005 1:03 AM