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Mathematics
In any $\Delta ABC,a(b \cos C-c \cos B)=$
\[\begin {array} {1 1} (1)\;b^2+c^2 & \quad (2)\;b^2-c^2 \\ (3)\;\frac{1}{b}+\frac{1}{c} & \quad (4)\;\frac{1}{b^2}-\frac{1}{c^2} \end {array}\]
jeemain
eamcet
math
2009
q28
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asked
Oct 9, 2013
by
meena.p
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