What is SIN(10**22) in your machine/calculator?

K.C.Ng uunet!Eng.Sun.COM!Kwok.Ng
Mon Dec 16 11:05:51 PST 1991


In preparing an article on the trignometric argument reduction,
I would like to find out the computed value of SIN(x) and COS(x) 
for
	1. x = 10**22
	2. x = 10**98  (decimal calculator only)
	3. x = 2**200  (binary machine only)
on various calculators and machines.

So far, I have, 

	x = 10**22	    sin x		cos x
	----------------------------------------------
	correct answer	-0.8522008497..	 0.5232147853..  
	sun4 (fp_pi=0)  -0.8522008497..	 0.5232147853..  
	sun3  		-0.6536528816..	 0.5679449675..  
	hp 20-s		-0.852200850	 0.523214785
	hp 15c		 0.7931056786	-0.6090840522
	casio fx-8100	     Error	     Error (*)	
	----------------------------------------------
	(*) On a casio fx-8100, any arugment larger than
	    2.6 in magnitude will result in error.
    


	x = 10**98	    sin x		cos x
	----------------------------------------------
	correct answer	 0.2522045989..	-0.9676739328..  
	hp 20-s		-0.137662378	-0.990479212
	hp 15c		-0.07497332812	-0.9971855394
	casio fx-8100	     Error	     Error	
	----------------------------------------------

	 
	x = 2**200	    sin x		cos x
	----------------------------------------------
	correct answer	-0.4788977997..	-0.8778706609..  
	sun4 (fp_pi=0)  -0.4788977997..	-0.8778706609.. 
	sun3  		-0.6936283589..	-0.7203330477..  
	----------------------------------------------


Can someone help me to fill up the table with answers on 
various machines or calculators? Thanks in advance.
To avoid flushing the mail list, please send the answer to me 
directly. I will summarize and post the result later.

-- K.C. Ng



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