HP 40gs - 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 12:27 AM