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![[Post New]](/templates/default/images/icon_minipost_new.gif) 24 Jul 2008 09:34:35 IST
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If cos(x-y),cosx,cos(x+y) are in H.P.,then cosxsec(y/2) is equal to................
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24 Jul 2008 10:25:53 IST
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is d ans  if yes den tell me i wud giv d ans
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25 Jul 2008 18:35:50 IST
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plz is it rite
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25 Jul 2008 19:31:00 IST
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i m afraid it isn't
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25 Jul 2008 19:47:08 IST
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is it cos x
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25 Jul 2008 20:29:01 IST
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answer is root 2
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- Gaurav Ragtah (spideyunlimited)
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Solving the whole thing using AM concept we finally get
xos^2x.cosy = cos^2y + cos^2x - 1
cos^2 x = (1-cos^2y) / (1-cosy)
cos^2 x = 1 + cos y
cos^2 x = 2cos^2(y/2)
cos^2 x. sec^2 (y/2) = 2
cosx.sec(y/2) = +- rt (2)
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- Gaurav Ragtah (spideyunlimited)
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