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![[Post New]](/templates/default/images/icon_minipost_new.gif) 10 May 2008 23:20:40 IST
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4. let 2/sqrt 13 be cos @ thn 3/sqrt13 becomes sin@
so the given expression becomes cos ` (cos( x-@)) = x-@
but this is true if <0x-@owise the expressn wud be pi -(x-@)
therefore @< xand @ = tan inv 3/2
so option D) is rite
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