Question
Thu March 08, 2012 By:

FIND THE VALUE OF:(1) sin 7 1/2 , (2) cos 7 1/2 , (3) tan 7 1/2.

Expert Reply
Thu March 08, 2012
sin15/2 = root((1-cos15)/2)
cos15/2 = root((1+cos15)/2) 
We can easily find the value of cos15 = cos(45-30) = cos45.cos30 + sin45.sin30 =
(root3 + 1)/2root2
On substituting the values in 1st and 2nd equation we get the values
and tan15/2 = sin15/2 / cos15/2
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