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Ask iit jee aieee pet cbse icse state board community Community Discussion Question: Arihant question
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[Post New]22 Apr 2008 21:08:50 IST
    Subject: Arihant question
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Ricky_rock (0)

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If a and b are positive quantities and ab,and y=asec-btan, then prove that its second order derivative will be positive.
    
[Post New]23 Apr 2008 18:29:34 IST
    Subject: Re:Arihant question
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please reply me                                 
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[Post New]23 Apr 2008 19:25:27 IST
    Subject: Re:Arihant question
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allamraju (3422)

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y'=asectan-bsec2,y"=asec3
+asectan2-2bsec2tan=asec
(sec-tan)2+2(a-b)sec2tan
 
 
theta belongs to 0,pi/2  then y" is +ve
MAKING A MISTAKE IS HUMAN BUT REPEATING IT IS IDIOTIC.
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