1.

LetS_n= cos ((n pi )/( 10)) , n = 1,2,3,…… thenthe valueof ( s_1 s_2 ……s_(10))/( s_1 + s_2 +…….. +s_(10)) isequal to

Answer»

`(1)/( sqrt(2))`
` (sqrt(3))/(2)`
`2 sqrt(2)`
`0`

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