HP 40gs - Page 225

Computer Algebra System (CAS) 14-43
gives:
4·cos(x)
3
–3·cos(x)
TLIN Linearize a trigonometric expression
TLIN has as an argument a trigonometric expression.
TLIN linearizes this expression in terms of sin(n x) and
cos(n x).
Example 1
Typing:
TLIN(COS(X) · COS(Y))
gives:
Example 2
Typing:
TLIN(COS(X)
3
)
gives:
Example 3
Typing:
TLIN(4·COS(X)
2
-2)
gives:
TRIG Simplify using sin(x)
2
+ cos(x)
2
= 1
TRIG has as an argument a trigonometric expression.
TRIG simplifies this expression using the identity
sin(x)
2
+cos(x)
2
= 1.
1
2
---
xy–()cos⋅
1
2
---
xy+()cos⋅+
1
4
---
3 x⋅()cos⋅
3
4
---
x()cos⋅+
22x⋅()cos⋅
hp40g+.book Page 43 Friday, December 9, 2005 12:27 AM