2 . 21. ΠΣ των " η -0, then. Στη 15...
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2 . 21. ΠΣ των " η -0, then. Στη 15 αφual to

11th - 12th Class
Maths
Solution
80
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4.0 (1 ratings)
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since, no condition is given yor ( x_{i} ), ( sum_{i=1}^{2 n} cos ^{-1} x_{i}=0 ) ( Rightarrow cos ^{-1} x_{1}+cos ^{-1} x_{2}-cdots-cos ^{-1} x_{2 n}=0 ) if ( x_{1}=x_{2}=x_{3}-cdots=x_{2 n}=1 ) then all toms become ( 0^{prime} ) and equation is satisfied. ( 80, ) uce heme to find, ( sum_{i=1}^{2 n} 1=1+1+1--cdots 2 n ) times ( n ) So, requicred ansiolen is an
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