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Ask iit jee aieee pet cbse icse state board community Discussion Response Post to: doubt 4
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[Post New]2 Mar 2007 17:33:21 IST
    Subject: Re:doubt 4
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vasanth (2315)

Blazing goIITian

Olaaa!! Perrrfect answer. 401  [556 rates]
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cos(60-x) cosx cos(60+x) = 1/4
[cos260 cos2x - sin260sin2x]cosx =1/4
 
[(cos2x)/4] cos2x - 3sin2x/4]cosx =1/4
cos4x - 3sin2xcosx =1
cos4x - 3cosx  - 3cos3x -1=0
 
solving the equation u'll get the value of x
and then u can generalise it 2npi +-x
 
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