HP 40gs hp 40gs_user's guide_English_E_HDPMSG40E07A.pdf - Page 226
Trigcos, Trigsin, Trigtan
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hp40g+.book Page 44 Friday, December 9, 2005 1:03 AM TRIGCOS TRIGSIN TRIGTAN 14-44 Typing: TRIG(SIN(X)2 + COS(X)2 + 1) gives: 2 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 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 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-----⋅---t--a---n---(---x---)--4----+-----3----⋅----t-a---n----(--x---)--2----+-----2tan (x)4 + 2 ⋅ tan (x)2 + 1 Computer Algebra System (CAS)