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![[Post New]](/templates/default/images/icon_minipost_new.gif) 3 Nov 2007 12:52:53 IST
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principal branch of sin is [-pi/2 , pi/2]
so u shd express sin 37 as the sin of an angle in this interval
pi/2 = 1.57 appr
now 12 pi = 37.7 almost
so sin-1(sin 37c ) can be written as sin-1(sin 12pi - 0.7 )= sin-1(sin -0.7 ) = -0.7
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