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» pure/appli maths question (in)
¼ÐÃD: pure/appli maths question (in)
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chingyingtiktau
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¥»©«³Ì«á¥Ñ chingyingtiktau ©ó 2008-8-3 02:58 PM ½s¿è
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Freedom is the freedom to say that two plus two makes four. If that is granted, all else follows.
2008-8-2 02:15 PM
#1
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let t= tan x/2
then dx=2dt/(1+t^2)
cosx = (1-t^2)/(1+t^2)
proof¤£¥´¤F ®ÑÀ³¸Ó¦³
¡ì = alt+41452
=>¡ì2dt/(5+5t^2+4-4t^2)
=2¡ìdt/(t^2+9)
=2/3(arc tan t/3)
=2/3[arc tan (tan x/2)/3]
2008-8-4 12:19 AM
#2
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(¤£¹L¤µ®É¤µ¤é¦Ò¸Õ·|¦n¦n¤H...´£§ALet t=tan(x/2).....)
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2008-8-4 07:36 AM
#3
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QUOTE:
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©ó 4-8-2008 07:36 µoªí¡C
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(¤£¹L¤µ®É¤µ¤é¦Ò¸Õ·|¦n¦n¤H...´£§ALet t=tan(x/2).....)
ÂI·|§r¡H CE Additional Maths ³£ø´£°Õ...
2008-8-11 10:51 PM
#4
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©ó 2008-8-11 10:51 PM µoªí¡C
ÂI·|§r¡H CE Additional Maths ³£ø´£°Õ...
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(PS substitution ¦bamath out ¥ªc, ©Ò¥Hø·|´£¬[°Õ)
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2008-8-12 02:18 PM
#5
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