hp40g+.book Page 44 Friday, December 9, 2005 1:03 AM

 

 

 

 

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:

 

 

 

 

cos(x)4 – cos(x)2 + 2

 

 

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:

 

 

 

 

sin(x)4 – sin(x)2 + 2

 

 

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:

 

 

 

 

2 ⋅ tan(x)4 + 3 ⋅ tan(x)2 + 2

 

 

 

 

------------------------------------------------------------------

 

 

 

 

 

tan(x)4 + 2 ⋅ tan(x)2 + 1

 

 

 

 

 

 

 

 

 

 

14-44

 

 

 

Computer Algebra System (CAS)