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2014-08-06T18:59:38+05:30

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Sin 55
------------  =  tan 55
cos 55

we know tan Ф  is positive and increasing in  (0 , π/2 )  from  0 to infinity.
tan 45 = 1  so tan 55  > tan 45 = 1 
so tan 55 > 1
so sin 55 > cos 55

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2014-08-07T15:05:14+05:30