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![[Post New]](/templates/default/images/icon_minipost_new.gif) 24 Jul 2007 15:50:16 IST
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(1+ sint)(1+ cost) = 5/4. find: (1- sint)(1- cost)
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remember (sint+cost)2 = 1 -2 sint.cost
(1-sint)(1-cost) = 1-(sint+cost) + sint.cost =
 1 -(sint+cost) + [(sint+cost)2 - 1]/2
solve for (sint+cost ) and then for sint.cost and calculate the value of (1-sint)(1-cost)
the answer is 9/4-3  5/2
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26 Jul 2007 09:22:40 IST
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Perfect approach Betu.
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Krishna Gopal Singh
B.Tech Chemical Engg
IIT Delhi 2002
Currently doing PhD from IIT Delhi |
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26 Jul 2007 12:05:59 IST
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intelligent answer you have
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