HP 40gs - Manual (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
--- x y – ( ) cos ⋅
1
2
--- x y + ( ) cos ⋅ +
1
4
--- 3 x ⋅ ( ) cos ⋅
3
4
--- x ( ) cos ⋅ +
2 2 x ⋅ ( ) cos ⋅
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