HP 40gs hp 40gs_user's guide_English_E_HDPMSG40E07A.pdf - Page 214
Xq1.41421, Simplify, Sin 3 X, Sin 7 X, Sin 5 X
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hp40g+.book Page 32 Friday, December 9, 2005 1:03 AM SIMPLIFY XNUM XQ Typing: SINCOS(EXP(i·X)) gives after turning on complex mode, if necessary: cos(x) + i · sin(x) Simplify SIMPLIFY simplifies an expression automatically. Typing: S I M P L I F Y ⎝⎛ S---I--N--(-3--S-⋅-I-X--N)--(+-5--S-⋅-I-X-N-)--(-7---⋅-X--)⎠⎞ gives, after simplification: 4 · cos(x)2 − 2 Evaluation of reals XNUM has an expression as a parameter. XNUM puts the calculator into approximate mode and returns the numeric value of the expression. Typing: XNUM(√2) gives: 1.41421356237 Rational approximation XQ has a real numeric expression as a parameter. XQ puts the calculator into exact mode and gives a rational or real approximation of the expression. Typing: XQ(1.41421) gives: 6---6---4---4----146981 14-32 Computer Algebra System (CAS)