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 Post subject: trigonometryPosted: Sat, 24 May 2003 16:12:02 UTC
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Joined: Fri, 2 May 2003 16:33:24 UTC
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Location: Hong Kong
Let x=sinA, y=sinB, z=sin(A+B). Express cos(A+B) in the form of the quotient of two polynomials with integral coefficients in x,y, and z.

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 Post subject: Posted: Sat, 24 May 2003 18:36:00 UTC
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Joined: Sun, 4 May 2003 16:04:19 UTC
Posts: 2906

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Has anyone noticed that the below is WRONG? Otherwise this statement would be true:

where

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 Post subject: Posted: Sat, 24 May 2003 18:39:18 UTC
 Member of the 'S.O.S. Math' Hall of Fame

Joined: Fri, 2 May 2003 16:33:24 UTC
Posts: 781
Location: Hong Kong
cool...
I doubt that there's enough space for me to write this answer into the blank, lol~

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/ ___| ___ __ _ _ __ ___ _ __ ____
\___ \ / _ \ / _ | '__ / _ \ '__ |_ /
___) | (_) | (_| | | | __/ | / /
|____/ \___ / \__,_|_| \__|_ | /___|

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 Post subject: Posted: Sat, 24 May 2003 19:32:58 UTC
 Site Admin

Joined: Sat, 26 Apr 2003 22:14:40 UTC
Posts: 2063
Location: El Paso TX (USA)
bugzpodder:
It looks nicer if you put a "\" in front of the trig functions, eg. "\sin A".

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